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(2/5)*x+3/7 = (-1/5)*x+1 // - (-1/5)*x+1
(2/5)*x-((-1/5)*x)+3/7-1 = 0
(2/5)*x+(1/5)*x+3/7-1 = 0
3/5*x-4/7 = 0 // + 4/7
3/5*x = 4/7 // : 3/5
x = 4/7/3/5
x = 20/21
x = 20/21
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