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(4*x)/5+1/4 = 12/20 // - 12/20
(4*x)/5+1/4-(12/20) = 0
(4*x)/5+1/4-3/5 = 0
4/5*x-7/20 = 0 // + 7/20
4/5*x = 7/20 // : 4/5
x = 7/20/4/5
x = 7/16
x = 7/16
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