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(1/7)*(21*x+2)-((3/14)*(14*x-2)) = 0
(1/7)*(21*x+2)+(-3/14)*(14*x-2) = 0
1/7*(21*x+2)-3/14*(14*x-2) = 0
1/7*(21*x+2)-3/14*(14*x-2) = 0
5/7 = 0
5/7 = 0
5/7 = 0 // * 7
5 = 0
x belongs to the empty set
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