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