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x in (-oo:+oo)
12/5 = x/45 // - x/45
12/5-(x/45) = 0
12/5-1/45*x = 0 // - 12/5
-1/45*x = -12/5 // : -1/45
x = -12/5/(-1/45)
x = 108
x = 108
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