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(7/2)*x-2 = 28-(4*x) // - 28-(4*x)
(7/2)*x+4*x-28-2 = 0
15/2*x-30 = 0 // + 30
15/2*x = 30 // : 15/2
x = 30/15/2
x = 4
x = 4
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