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(-6/7)*x-(5/9) = (1/2)*x-1951/126 // - (1/2)*x-1951/126
(-6/7)*x-((1/2)*x)-(5/9)-(-1951/126) = 0
(-6/7)*x+(-1/2)*x-5/9+1951/126 = 0
209/14-19/14*x = 0 // - 209/14
-19/14*x = -209/14 // : -19/14
x = -209/14/(-19/14)
x = 11
x = 11
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