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(3/7)*x+(4/5)*x-8 = -379/42 // + -379/42
(3/7)*x+(4/5)*x-(-379/42)-8 = 0
(3/7)*x+(4/5)*x+379/42-8 = 0
43/35*x+43/42 = 0 // - 43/42
43/35*x = -43/42 // : 43/35
x = -43/42/43/35
x = -5/6
x = -5/6
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