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(1/2)*(2*x-1) = -1/7-(3/7) // + -1/7-(3/7)
(1/2)*(2*x-1)-(-1/7)+3/7 = 0
(1/2)*(2*x-1)+1/7+3/7 = 0
1/2*(2*x-1)+1/7+3/7 = 0
(1/2*7*(2*x-1))/7+1/7+3/7 = 0
1/2*7*(2*x-1)+1+3 = 0
7*x-5/2+3 = 0
7*x+1/2 = 0
(7*x+1/2)/7 = 0
(7*x+1/2)/7 = 0 // * 7
7*x+1/2 = 0
7*x+1/2 = 0 // - 1/2
7*x = -1/2 // : 7
x = -1/2/7
x = -1/14
x = -1/14
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