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(4*x)/10-(x/4) = 9/20 // - 9/20
(4*x)/10-(x/4)-(9/20) = 0
(4*x)/10-(x/4)-9/20 = 0
3/20*x-9/20 = 0 // + 9/20
3/20*x = 9/20 // : 3/20
x = 9/20/3/20
x = 3
x = 3
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