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