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x in (-oo:+oo)
90/100 = x/15 // - x/15
90/100-(x/15) = 0
9/10-1/15*x = 0 // - 9/10
-1/15*x = -9/10 // : -1/15
x = -9/10/(-1/15)
x = 27/2
x = 27/2
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