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x in (-oo:+oo)
(3/7)*x-((1/4)*x) = 11 // - 11
(3/7)*x-((1/4)*x)-11 = 0
(3/7)*x+(-1/4)*x-11 = 0
5/28*x-11 = 0 // + 11
5/28*x = 11 // : 5/28
x = 11/5/28
x = 308/5
x = 308/5
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