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