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x in (-oo:+oo)
68/80 = x/10 // - x/10
68/80-(x/10) = 0
17/20-1/10*x = 0 // - 17/20
-1/10*x = -17/20 // : -1/10
x = -17/20/(-1/10)
x = 17/2
x = 17/2
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