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(3*x)/10+(8*x)/10-((9*x)/14)-(9/14) = (31*x)/14+(4*x)/35-(4/14)-(1/35) // - (31*x)/14+(4*x)/35-(4/14)-(1/35)
(3*x)/10+(8*x)/10-((9*x)/14)-((31*x)/14)-((4*x)/35)-(9/14)+4/14+1/35 = 0
(3*x)/10+(8*x)/10+(-9/14)*x+(-31/14)*x+(-4/35)*x-9/14+4/14+1/35 = 0
-131/70*x-23/70 = 0 // + 23/70
-131/70*x = 23/70 // : -131/70
x = 23/70/(-131/70)
x = -23/131
x = -23/131
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