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x in (-oo:+oo)
(x+4)/5 = x/4 // - x/4
(x+4)/5-(x/4) = 0
(x+4)/5-x/4 = 0
(4*(x+4))/(4*5)+(5*(-x))/(4*5) = 0
4*(x+4)+5*(-x) = 0
16-x = 0
(16-x)/(4*5) = 0
(16-x)/(4*5) = 0 // * 4*5
16-x = 0
16-x = 0 // - 16
-x = -16 // * -1
x = 16
x = 16
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