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x = 27
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3x+12x = 15 15x = 15 x = 1
x=5
4x+7-3x = 15 4x-3x = 15-7 x = 8
x = 2
3x - 5 + 3x = 1x + 15 3x + 3x -1x = 15 + 5 5x = 20 5x/5 = 20/5 x = 4