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(1/3)*x+3/5 = 4/5 // - 4/5
(1/3)*x+3/5-(4/5) = 0
(1/3)*x+3/5-4/5 = 0
1/3*x-1/5 = 0 // + 1/5
1/3*x = 1/5 // : 1/3
x = 1/5/1/3
x = 3/5
x = 3/5
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