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3(x+1) = 4(x-3)

?2011-11-29T02:41:59Z

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3x + 3 = 4x - 12
3 + 12 = 4x - 3x
15 = x

?2011-11-29T11:46:41Z

3x+3=4x-12
3+12=4x-3x
15=x
so the value of x is 15