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(1/2)*x+(1/2)*x+x+x-25-15+100 = 540 // - 540
(1/2)*x+(1/2)*x+x+x-540-25-15+100 = 0
3*x-480 = 0 // + 480
3*x = 480 // : 3
x = 480/3
x = 160
x = 160
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