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x in (-oo:+oo)
X/3-(1/2) = x/4 // - x/4
X/3-(x/4)-(1/2) = 0
X/3-(x/4)-1/2 = 0
1/3*X-1/4*x-1/2 = 0 // - 1/3*X-1/2
-1/4*x = -(1/3*X-1/2) // : -1/4
x = (-(1/3*X-1/2))/(-1/4)
x = -4*(1/2-(1/3*X))
x = -4*(1/2-(1/3*X))
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