5=12-x whats the answer? 3x-4=-6 whats the answer? 4=13-x whats the answer? 7x+9=1 whats the answer?

5=12-x

x=7

3x-4=-6

x=(-)2/3

4=13-x

x=9

7x+9=1

x=(-)8/7

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12 - x =5, so 12 - 5 = x, so x=7

3x -4 =6, so 3x - 4 + 4 = 6+4, so 3x= 10, so x = 3.3

13 - x = 4, so 13 - 4 = x, so x=9

7x + 9 = 1, so 7x +9 -9 = 1- 9, so 7x = -8, so x = -1.14

5=12-x --> x = 12-5 --> x = 7

3x-4=-6 --> 3x =-2 --> x = -2/3

4=13-x --> x = 13-4 --> x = 9

7x + 9 = 1 --> 7x = -8 --> x = -8/7

3x+5= -4(x-6) First do the distributive assets(multiply 4 with the parenthesis) 3x+5= -4x+24 Now upload -4x to the two side 3x+5= -4x+24 +4x +4x 7x+5=24 Now subtract 5 from the two side 7x+5=24 -5 -5 7x=19 Divide 7 on the two side 7x/7x=19/7x x=19/7

All of them get x on its own

x = 7

3x = -6 + 4 = -2 so x = -2/3

x = 9

7x = -8 So x = -8/7 or - 1 and 1/7

5=12-x \-5+x (moving the X to the left side and the 5 to the right side)

x = 12 - 5 = 7

3x-4=-6

3x=-6+4 = -2

x = -2/3

4=13-x

x=9

7x+9=1

7x=-8

x=-8/7

Tee Tee, I think you need to know HOW rather than WHAT. So, let's take the first one

5 = 12 - x

add x to both sides and you get

x + 5 = 12

subtract 5 from both sides and you get

x +5 - 5 = 12 - 5

x + 0 = 7

x = 7

5x = 12 - x .... x=7

3x -4= -6 ..... x= - 2/3

4=13-x ....... x = 9

7x +9=1 ..... x= - 8/7

5=12-x

x=7

3x-4=-6

x=-2/3

4=13-x

x=9

7x+9=1

x=-8/7

I'll help, I won't do 'em. Here's the trick in these problems. The idea is to move the x to the left side, and all the other stuff to the right. The rules are simple--you are allowed to add, sub. div or multiply anything , as long as you do it to the other side as well.

So, in the first, I would add x to both sides...that way -x disappears from the right...then sub 5 from both sides. bada bing. done.