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x in (-oo:+oo)
(1/6)*x+(1/4)*x = -4 // + 4
(1/6)*x+(1/4)*x+4 = 0
5/12*x+4 = 0 // - 4
5/12*x = -4 // : 5/12
x = -4/5/12
x = -48/5
x = -48/5
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