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(5/2)*(x-5) = 30 // - 30
(5/2)*(x-5)-30 = 0
5/2*(x-5)-30 = 0
5/2*(x-5)-30 = 0
5/2*x-85/2 = 0
5/2*x-85/2 = 0
5/2*x-85/2 = 0 // + 85/2
5/2*x = 85/2 // : 5/2
x = 85/2/5/2
x = 17
x = 17
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