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