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x in (-oo:+oo)
9/10 = x/100 // - x/100
9/10-(x/100) = 0
9/10-1/100*x = 0 // - 9/10
-1/100*x = -9/10 // : -1/100
x = -9/10/(-1/100)
x = 90
x = 90
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