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3*x-(2*((15-x)/2)) = 5 // - 5
3*x-(2*((15-x)/2))-5 = 0
x+3*x-15-5 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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