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(1/2)*x-2/5 = 8/5 // - 8/5
(1/2)*x-2/5-(8/5) = 0
(1/2)*x-2/5-8/5 = 0
1/2*x-2 = 0 // + 2
1/2*x = 2 // : 1/2
x = 2/1/2
x = 4
x = 4
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