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x in (-oo:+oo)
(4*(x+5))/5 = 2*x-1 // - 2*x-1
(4*(x+5))/5-(2*x)+1 = 0
(4*(x+5))/5-2*x+1 = 0
(4*(x+5))/5+(-2*5*x)/5+(1*5)/5 = 0
4*(x+5)-2*5*x+1*5 = 0
5-6*x+20 = 0
25-6*x = 0
(25-6*x)/5 = 0
(25-6*x)/5 = 0 // * 5
25-6*x = 0
25-6*x = 0 // - 25
-6*x = -25 // : -6
x = -25/(-6)
x = 25/6
x = 25/6
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