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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
1/5*x-4/7 = 0 // + 4/7
1/5*x = 4/7 // : 1/5
x = 4/7/1/5
x = 20/7
x = 20/7
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