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x in (-oo:+oo)
(4/5)*x+4/3 = 2*x // - 2*x
(4/5)*x-(2*x)+4/3 = 0
(4/5)*x-2*x+4/3 = 0
4/3-6/5*x = 0 // - 4/3
-6/5*x = -4/3 // : -6/5
x = -4/3/(-6/5)
x = 10/9
x = 10/9
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