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((x+13)^1)/2 = 10 // - 10
((x+13)^1)/2-10 = 0
(x+13)/2-10 = 0
(x+13)/2+(-10*2)/2 = 0
x-10*2+13 = 0
x-7 = 0
(x-7)/2 = 0
(x-7)/2 = 0 // * 2
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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