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3*x-x+x-(5/5)+2/7 = 3 // - 3
3*x-x+x-(5/5)+2/7-3 = 0
3*x-x+x+2/7-3-1 = 0
3*x-26/7 = 0 // + 26/7
3*x = 26/7 // : 3
x = 26/7/3
x = 26/21
x = 26/21
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