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(2*x)/5 = 1/20 // - 1/20
(2*x)/5-(1/20) = 0
(2*x)/5-1/20 = 0
2/5*x-1/20 = 0 // + 1/20
2/5*x = 1/20 // : 2/5
x = 1/20/2/5
x = 1/8
x = 1/8
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