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(1/4)*x-(2/5) = 3/8 // - 3/8
(1/4)*x-(2/5)-(3/8) = 0
(1/4)*x-2/5-3/8 = 0
1/4*x-31/40 = 0 // + 31/40
1/4*x = 31/40 // : 1/4
x = 31/40/1/4
x = 31/10
x = 31/10
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