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x in (-oo:+oo)
17/8 = x/20 // - x/20
17/8-(x/20) = 0
17/8-1/20*x = 0 // - 17/8
-1/20*x = -17/8 // : -1/20
x = -17/8/(-1/20)
x = 85/2
x = 85/2
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