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x in (-oo:+oo)
(2/7)*x-6 = (9/7)*x // - (9/7)*x
(2/7)*x-((9/7)*x)-6 = 0
(2/7)*x+(-9/7)*x-6 = 0
-x-6 = 0 // + 6
-x = 6 // * -1
x = -6
x = -6
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