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x in (-oo:+oo)
(1/3)*x+(1/4)*x = 4 // - 4
(1/3)*x+(1/4)*x-4 = 0
7/12*x-4 = 0 // + 4
7/12*x = 4 // : 7/12
x = 4/7/12
x = 48/7
x = 48/7
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