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(1/2)*x+x+x+x+5 = 100 // - 100
(1/2)*x+x+x+x-100+5 = 0
7/2*x-95 = 0 // + 95
7/2*x = 95 // : 7/2
x = 95/7/2
x = 190/7
x = 190/7
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