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(2*x)/5 = 8/2 // - 8/2
(2*x)/5-(8/2) = 0
(2*x)/5-4 = 0
2/5*x-4 = 0 // + 4
2/5*x = 4 // : 2/5
x = 4/2/5
x = 10
x = 10
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