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(3/5)*x-(7/10) = 7/5 // - 7/5
(3/5)*x-(7/10)-(7/5) = 0
(3/5)*x-7/10-7/5 = 0
3/5*x-21/10 = 0 // + 21/10
3/5*x = 21/10 // : 3/5
x = 21/10/3/5
x = 7/2
x = 7/2
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