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(6/7)*x+(1/2)*x-5/9 = 820/63 // - 820/63
(6/7)*x+(1/2)*x-5/9-(820/63) = 0
(6/7)*x+(1/2)*x-5/9-820/63 = 0
19/14*x-95/7 = 0 // + 95/7
19/14*x = 95/7 // : 19/14
x = 95/7/19/14
x = 10
x = 10
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