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x = 7 - 12
x = -5
3x + 4 = 28
3x = 28 - 4
3x = 24
x = 24/3
x = 8
3x + 5 = 2x - 7
3x - 2x = -7 - 5
x = -12
5x - 6 = 2x + 9
5x - 2x = 9 + 6
3x = 15
x = 5