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x in (-oo:+oo)
(x+5)/8 = (-1/2)*x // - (-1/2)*x
(x+5)/8-((-1/2)*x) = 0
(x+5)/8+(1/2)*x = 0
(x+5)/8+x/2 = 0
(2*(x+5))/(2*8)+(8*x)/(2*8) = 0
2*(x+5)+8*x = 0
10*x+10 = 0
(10*x+10)/(2*8) = 0
(10*x+10)/(2*8) = 0 // * 2*8
10*x+10 = 0
10*x+10 = 0 // - 10
10*x = -10 // : 10
x = -10/10
x = -1
x = -1
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