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(1/3)*(3*x-1) = -1/7-(5/7) // + -1/7-(5/7)
(1/3)*(3*x-1)-(-1/7)+5/7 = 0
(1/3)*(3*x-1)+1/7+5/7 = 0
1/3*(3*x-1)+1/7+5/7 = 0
(1/3*7*(3*x-1))/7+1/7+5/7 = 0
1/3*7*(3*x-1)+1+5 = 0
7*x-4/3+5 = 0
7*x+11/3 = 0
(7*x+11/3)/7 = 0
(7*x+11/3)/7 = 0 // * 7
7*x+11/3 = 0
7*x+11/3 = 0 // - 11/3
7*x = -11/3 // : 7
x = -11/3/7
x = -11/21
x = -11/21
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