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5*x+2/3 = 59/21 // - 59/21
5*x+2/3-(59/21) = 0
5*x+2/3-59/21 = 0
5*x-15/7 = 0 // + 15/7
5*x = 15/7 // : 5
x = 15/7/5
x = 3/7
x = 3/7
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