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7/9-3*x = -((1/7)*x)-131/63 // + -((1/7)*x)-131/63
(1/7)*x-3*x+7/9-(-131/63) = 0
(1/7)*x-3*x+7/9+131/63 = 0
20/7-20/7*x = 0 // - 20/7
-20/7*x = -20/7 // : -20/7
x = -20/7/(-20/7)
x = 1
x = 1
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