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----------------------------- x4
3x+7 = 4x -8-2
7+8+2 = 4x-3x
17 = x
3/4x + 7/4 = x - 5/2
3/4x - x = -5/2 - 7/4
-1/4x = -17/4
x = -17/4 / -1/4
x = 17