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x in (-oo:+oo)
12 = (3/12)*x // - (3/12)*x
12-((3/12)*x) = 0
(-1/4)*x+12 = 0
12-1/4*x = 0 // - 12
-1/4*x = -12 // : -1/4
x = -12/(-1/4)
x = 48
x = 48
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