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x in (-oo:+oo)
9/10 = x/5 // - x/5
9/10-(x/5) = 0
9/10-1/5*x = 0 // - 9/10
-1/5*x = -9/10 // : -1/5
x = -9/10/(-1/5)
x = 9/2
x = 9/2
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