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(4/5)*x-(1/10) = 2/10 // - 2/10
(4/5)*x-(1/10)-(2/10) = 0
(4/5)*x-1/10-1/5 = 0
4/5*x-3/10 = 0 // + 3/10
4/5*x = 3/10 // : 4/5
x = 3/10/4/5
x = 3/8
x = 3/8
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