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(2*x)/5+1/10 = 4/5 // - 4/5
(2*x)/5+1/10-(4/5) = 0
(2*x)/5+1/10-4/5 = 0
2/5*x-7/10 = 0 // + 7/10
2/5*x = 7/10 // : 2/5
x = 7/10/2/5
x = 7/4
x = 7/4
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