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x in (-oo:+oo)
(1/2)*(2*x-1) = -1/7-(4/7) // + -1/7-(4/7)
(1/2)*(2*x-1)-(-1/7)+4/7 = 0
(1/2)*(2*x-1)+1/7+4/7 = 0
1/2*(2*x-1)+1/7+4/7 = 0
(1/2*7*(2*x-1))/7+1/7+4/7 = 0
1/2*7*(2*x-1)+1+4 = 0
7*x-5/2+4 = 0
7*x+3/2 = 0
(7*x+3/2)/7 = 0
(7*x+3/2)/7 = 0 // * 7
7*x+3/2 = 0
7*x+3/2 = 0 // - 3/2
7*x = -3/2 // : 7
x = -3/2/7
x = -3/14
x = -3/14
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