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(3/2)*x-12 = 28-(2*x) // - 28-(2*x)
(3/2)*x+2*x-28-12 = 0
7/2*x-40 = 0 // + 40
7/2*x = 40 // : 7/2
x = 40/7/2
x = 80/7
x = 80/7
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