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x in (-oo:+oo)
90/25 = x/5 // - x/5
90/25-(x/5) = 0
18/5-1/5*x = 0 // - 18/5
-1/5*x = -18/5 // : -1/5
x = -18/5/(-1/5)
x = 18
x = 18
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