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x in (-oo:+oo)
12/4 = 5*x-6*2*x // - 5*x-6*2*x
12/4-(5*x)-(-6*2*x) = 0
12*x-5*x+12/4 = 0
7*x+3 = 0 // - 3
7*x = -3 // : 7
x = -3/7
x = -3/7
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