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x in (-oo:+oo)
(665/5)*(x-8) = 13 // - 13
(665/5)*(x-8)-13 = 0
133*(x-8)-13 = 0
133*(x-8)-13 = 0
133*x-1077 = 0
133*x-1077 = 0
133*x-1077 = 0 // + 1077
133*x = 1077 // : 133
x = 1077/133
x = 1077/133
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