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X in (-oo:+oo)
(X-4)/12 = 6/12 // - 6/12
(X-4)/12-(6/12) = 0
(X-4)/12-1/2 = 0
(2*(X-4))/(2*12)+(-1*12)/(2*12) = 0
2*(X-4)-1*12 = 0
2*X-20 = 0
(2*X-20)/(2*12) = 0
(2*X-20)/(2*12) = 0 // * 2*12
2*X-20 = 0
2*X-20 = 0 // + 20
2*X = 20 // : 2
X = 20/2
X = 10
X = 10
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