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x in (-oo:+oo)
27/45 = x/5 // - x/5
27/45-(x/5) = 0
3/5-1/5*x = 0 // - 3/5
-1/5*x = -3/5 // : -1/5
x = -3/5/(-1/5)
x = 3
x = 3
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