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x in (-oo:+oo)
(x+5)/4 = x/2+17/20 // - x/2+17/20
(x+5)/4-(x/2)-(17/20) = 0
(x+5)/4-(x/2)-17/20 = 0
(x+5)/4-x/2-17/20 = 0
(2*20*(x+5))/(2*4*20)+(4*20*(-x))/(2*4*20)+(-17*2*4)/(2*4*20) = 0
2*20*(x+5)+4*20*(-x)-17*2*4 = 0
200-40*x-136 = 0
64-40*x = 0
(64-40*x)/(2*4*20) = 0
(64-40*x)/(2*4*20) = 0 // * 2*4*20
64-40*x = 0
64-40*x = 0 // - 64
-40*x = -64 // : -40
x = -64/(-40)
x = 8/5
x = 8/5
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