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x in (-oo:+oo)
(6/7)*x-2*x+7/10 = 1081/630 // - 1081/630
(6/7)*x-2*x+7/10-(1081/630) = 0
(6/7)*x-2*x+7/10-1081/630 = 0
-8/7*x-64/63 = 0 // + 64/63
-8/7*x = 64/63 // : -8/7
x = 64/63/(-8/7)
x = -8/9
x = -8/9
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