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(4/7)*x+1/3 = 3*x-(2/14) // - 3*x-(2/14)
(4/7)*x-(3*x)+1/3+2/14 = 0
(4/7)*x-3*x+1/3+2/14 = 0
10/21-17/7*x = 0 // - 10/21
-17/7*x = -10/21 // : -17/7
x = -10/21/(-17/7)
x = 10/51
x = 10/51
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