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13*x+3/8-12 = 13/40 // - 13/40
13*x+3/8-(13/40)-12 = 0
13*x+3/8-13/40-12 = 0
13*x-239/20 = 0 // + 239/20
13*x = 239/20 // : 13
x = 239/20/13
x = 239/260
x = 239/260
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