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(1/4)*(4*x-1) = -1/7-(2/7) // + -1/7-(2/7)
(1/4)*(4*x-1)-(-1/7)+2/7 = 0
(1/4)*(4*x-1)+1/7+2/7 = 0
1/4*(4*x-1)+1/7+2/7 = 0
(1/4*7*(4*x-1))/7+1/7+2/7 = 0
1/4*7*(4*x-1)+1+2 = 0
7*x-3/4+2 = 0
7*x+5/4 = 0
(7*x+5/4)/7 = 0
(7*x+5/4)/7 = 0 // * 7
7*x+5/4 = 0
7*x+5/4 = 0 // - 5/4
7*x = -5/4 // : 7
x = -5/4/7
x = -5/28
x = -5/28
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