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x in (-oo:+oo)
(4*(x+2))/5 = -x // + x
(4*(x+2))/5+x = 0
(4*(x+2))/5+(5*x)/5 = 0
4*(x+2)+5*x = 0
9*x+8 = 0
(9*x+8)/5 = 0
(9*x+8)/5 = 0 // * 5
9*x+8 = 0
9*x+8 = 0 // - 8
9*x = -8 // : 9
x = -8/9
x = -8/9
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