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7*x-(4/5) = (-1/7)*x-(793/210) // - (-1/7)*x-(793/210)
7*x-((-1/7)*x)-(4/5)+793/210 = 0
7*x+(1/7)*x-4/5+793/210 = 0
50/7*x+125/42 = 0 // - 125/42
50/7*x = -125/42 // : 50/7
x = -125/42/50/7
x = -5/12
x = -5/12
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