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x in (-oo:+oo)
9*x+49/70-85 = x // - x
9*x-x+49/70-85 = 0
8*x-843/10 = 0 // + 843/10
8*x = 843/10 // : 8
x = 843/10/8
x = 843/80
x = 843/80
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