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(x-7)/2 = 2.5 // - 2.5
(x-7)/2-2.5 = 0
(x-7)/2+(-2.5*2)/2 = 0
x-2.5*2-7 = 0
x-12 = 0
(x-12)/2 = 0
(x-12)/2 = 0 // * 2
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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