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x in (-oo:+oo)
(6/7)*x-4 = (13/7)*x // - (13/7)*x
(6/7)*x-((13/7)*x)-4 = 0
(6/7)*x+(-13/7)*x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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