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(35*x+25)/15 = 4 // - 4
(35*x+25)/15-4 = 0
(35*x+25)/15+(-4*15)/15 = 0
35*x-4*15+25 = 0
35*x-35 = 0
(35*x-35)/15 = 0
(35*x-35)/15 = 0 // * 15
35*x-35 = 0
35*x-35 = 0 // + 35
35*x = 35 // : 35
x = 35/35
x = 1
x = 1
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