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x in (-oo:+oo)
-((6/7)*x)-2/7 = -64/77 // + -64/77
-((6/7)*x)-2/7-(-64/77) = 0
(-6/7)*x-2/7+64/77 = 0
6/11-6/7*x = 0 // - 6/11
-6/7*x = -6/11 // : -6/7
x = -6/11/(-6/7)
x = 7/11
x = 7/11
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