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3*x-(x/3)-(5/7) = (2*x)/21+1/7 // - (2*x)/21+1/7
3*x-(x/3)-((2*x)/21)-(5/7)-(1/7) = 0
3*x-(x/3)+(-2/21)*x-5/7-1/7 = 0
18/7*x-6/7 = 0 // + 6/7
18/7*x = 6/7 // : 18/7
x = 6/7/18/7
x = 1/3
x = 1/3
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