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x in (-oo:+oo)
(1/2)*(2*x-1) = -1/7-(3/3) // + -1/7-(3/3)
(1/2)*(2*x-1)-(-1/7)+3/3 = 0
(1/2)*(2*x-1)+1/7+3/3 = 0
1/2*(2*x-1)+1/7+1 = 0
(1/2*7*(2*x-1))/7+1/7+(1*7)/7 = 0
1/2*7*(2*x-1)+1*7+1 = 0
7*x-5/2+7 = 0
7*x+9/2 = 0
(7*x+9/2)/7 = 0
(7*x+9/2)/7 = 0 // * 7
7*x+9/2 = 0
7*x+9/2 = 0 // - 9/2
7*x = -9/2 // : 7
x = -9/2/7
x = -9/14
x = -9/14
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