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