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x in (-oo:+oo)
X/11 = x/12-4 // - x/12-4
X/11-(x/12)+4 = 0
1/11*X-1/12*x+4 = 0 // - 1/11*X+4
-1/12*x = -(1/11*X+4) // : -1/12
x = (-(1/11*X+4))/(-1/12)
x = 12*(1/11*X+4)
x = 12*(1/11*X+4)
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