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