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x in (-oo:+oo)
5/1-((1/3)*x) = (1/12)*x // - (1/12)*x
5/1-((1/3)*x)-((1/12)*x) = 0
(-1/3)*x+(-1/12)*x+5 = 0
5-5/12*x = 0 // - 5
-5/12*x = -5 // : -5/12
x = -5/(-5/12)
x = 12
x = 12
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