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x in (-oo:+oo)
(14*x-12)/12 = 9/12 // - 9/12
(14*x-12)/12-(9/12) = 0
(14*x-12)/12-3/4 = 0
(4*(14*x-12))/(4*12)+(-3*12)/(4*12) = 0
4*(14*x-12)-3*12 = 0
56*x-84 = 0
(56*x-84)/(4*12) = 0
(56*x-84)/(4*12) = 0 // * 4*12
56*x-84 = 0
56*x-84 = 0 // + 84
56*x = 84 // : 56
x = 84/56
x = 3/2
x = 3/2
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