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(3/7)*x+5 = (-1/5)*x+161/30 // - (-1/5)*x+161/30
(3/7)*x-((-1/5)*x)-(161/30)+5 = 0
(3/7)*x+(1/5)*x-161/30+5 = 0
22/35*x-11/30 = 0 // + 11/30
22/35*x = 11/30 // : 22/35
x = 11/30/22/35
x = 7/12
x = 7/12
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