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