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x in (-oo:+oo)
(x-1)/2 = 7 // - 7
(x-1)/2-7 = 0
(x-1)/2+(-7*2)/2 = 0
x-7*2-1 = 0
x-15 = 0
(x-15)/2 = 0
(x-15)/2 = 0 // * 2
x-15 = 0
x-15 = 0 // + 15
x = 15
x = 15
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