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