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x in (-oo:+oo)
4/5 = x/45 // - x/45
4/5-(x/45) = 0
4/5-1/45*x = 0 // - 4/5
-1/45*x = -4/5 // : -1/45
x = -4/5/(-1/45)
x = 36
x = 36
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