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(3/7)*x-(2/5) = 11/35-x // - 11/35-x
(3/7)*x+x-(2/5)-(11/35) = 0
(3/7)*x+x-2/5-11/35 = 0
10/7*x-5/7 = 0 // + 5/7
10/7*x = 5/7 // : 10/7
x = 5/7/10/7
x = 1/2
x = 1/2
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