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