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it is 4
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the answer is 3 4 x 3 = 12 not 4x4
5x+12 = 4x-88 x = -100
3x-4x=12 that means -x equals 12 so x equals -12
-2x=-4x*24 x=12
4x-5=7 4x=12 x=3
8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4