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x in (-oo:+oo)
(1/3)*x = -((1/4)*x)-7 // + -((1/4)*x)-7
(1/3)*x+(1/4)*x+7 = 0
7/12*x+7 = 0 // - 7
7/12*x = -7 // : 7/12
x = -7/7/12
x = -12
x = -12
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