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12*x-(13/21) = 20 // - 20
12*x-(13/21)-20 = 0
12*x-13/21-20 = 0
12*x-433/21 = 0 // + 433/21
12*x = 433/21 // : 12
x = 433/21/12
x = 433/252
x = 433/252
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