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x in (-oo:+oo)
(x+243)/5 = 85 // - 85
(x+243)/5-85 = 0
(x+243)/5+(-85*5)/5 = 0
x-85*5+243 = 0
x-182 = 0
(x-182)/5 = 0
(x-182)/5 = 0 // * 5
x-182 = 0
x-182 = 0 // + 182
x = 182
x = 182
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