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x in (-oo:+oo)
(1/5)*(x+8) = (3/5)*x // - (3/5)*x
(1/5)*(x+8)-((3/5)*x) = 0
(1/5)*(x+8)+(-3/5)*x = 0
1/5*(x+8)+(-3*x)/5 = 0
(1/5*5*(x+8))/5+(-3*x)/5 = 0
1/5*5*(x+8)-3*x = 0
8-2*x = 0
(8-2*x)/5 = 0
(8-2*x)/5 = 0 // * 5
8-2*x = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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