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