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x in (-oo:+oo)
(x+7)/15 = 10 // - 10
(x+7)/15-10 = 0
(x+7)/15+(-10*15)/15 = 0
x-10*15+7 = 0
x-143 = 0
(x-143)/15 = 0
(x-143)/15 = 0 // * 15
x-143 = 0
x-143 = 0 // + 143
x = 143
x = 143
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