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x in (-oo:+oo)
x/(-8) = -5*17 // + -5*17
x/(-8)-(-5*17) = 0
x/(-8)+85 = 0
85-1/8*x = 0 // - 85
-1/8*x = -85 // : -1/8
x = -85/(-1/8)
x = 680
x = 680
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