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x in (-oo:+oo)
(8/9)*x+10 = 2*x+13 // - 2*x+13
(8/9)*x-(2*x)-13+10 = 0
(8/9)*x-2*x-13+10 = 0
-10/9*x-3 = 0 // + 3
-10/9*x = 3 // : -10/9
x = 3/(-10/9)
x = -27/10
x = -27/10
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