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(5*x-15)/2 = 10 // - 10
(5*x-15)/2-10 = 0
(5*x-15)/2+(-10*2)/2 = 0
5*x-10*2-15 = 0
5*x-35 = 0
(5*x-35)/2 = 0
(5*x-35)/2 = 0 // * 2
5*x-35 = 0
5*x-35 = 0 // + 35
5*x = 35 // : 5
x = 35/5
x = 7
x = 7
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