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