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