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x in (-oo:+oo)
9/10 = x/20 // - x/20
9/10-(x/20) = 0
9/10-1/20*x = 0 // - 9/10
-1/20*x = -9/10 // : -1/20
x = -9/10/(-1/20)
x = 18
x = 18
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