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(1/2)*x+1/2 = 4/5 // - 4/5
(1/2)*x+1/2-(4/5) = 0
(1/2)*x+1/2-4/5 = 0
1/2*x-3/10 = 0 // + 3/10
1/2*x = 3/10 // : 1/2
x = 3/10/1/2
x = 3/5
x = 3/5
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