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x in (-oo:+oo)
(5/7)*x-2/7 = (6/7)*x+10/7 // - (6/7)*x+10/7
(5/7)*x-((6/7)*x)-2/7-(10/7) = 0
(5/7)*x+(-6/7)*x-2/7-10/7 = 0
-1/7*x-12/7 = 0 // + 12/7
-1/7*x = 12/7 // : -1/7
x = 12/7/(-1/7)
x = -12
x = -12
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