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(2/5)*x-(1/4) = 1/20 // - 1/20
(2/5)*x-(1/4)-(1/20) = 0
(2/5)*x-1/4-1/20 = 0
2/5*x-3/10 = 0 // + 3/10
2/5*x = 3/10 // : 2/5
x = 3/10/2/5
x = 3/4
x = 3/4
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