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x in (-oo:+oo)
125-(x/12) = 2*x // - 2*x
125-(x/12)-(2*x) = 0
125-(x/12)-2*x = 0
125-25/12*x = 0 // - 125
-25/12*x = -125 // : -25/12
x = -125/(-25/12)
x = 60
x = 60
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