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(1/5)*x+2/5 = 4/5 // - 4/5
(1/5)*x+2/5-(4/5) = 0
(1/5)*x+2/5-4/5 = 0
1/5*x-2/5 = 0 // + 2/5
1/5*x = 2/5 // : 1/5
x = 2/5/1/5
x = 2
x = 2
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