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8*(x/2-10)+5*x+12*(x/2) = 1460 // - 1460
8*(x/2-10)+5*x+12*(x/2)-1460 = 0
8*(1/2*x-10)+5*x+6*x-1460 = 0
8*(1/2*x-10)+5*x+6*x-1460 = 0
9*x+6*x-1460-80 = 0
15*x-1460-80 = 0
15*x-1540 = 0
15*x-1540 = 0
15*x-1540 = 0 // + 1540
15*x = 1540 // : 15
x = 1540/15
x = 308/3
x = 308/3
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