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(3/5)*x-(7/10) = 2/5 // - 2/5
(3/5)*x-(7/10)-(2/5) = 0
(3/5)*x-7/10-2/5 = 0
3/5*x-11/10 = 0 // + 11/10
3/5*x = 11/10 // : 3/5
x = 11/10/3/5
x = 11/6
x = 11/6
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