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x in (-oo:+oo)
(x+6)/3 = 2*x-5 // - 2*x-5
(x+6)/3-(2*x)+5 = 0
(x+6)/3-2*x+5 = 0
(x+6)/3+(-2*3*x)/3+(3*5)/3 = 0
x-2*3*x+3*5+6 = 0
6-5*x+15 = 0
21-5*x = 0
(21-5*x)/3 = 0
(21-5*x)/3 = 0 // * 3
21-5*x = 0
21-5*x = 0 // - 21
-5*x = -21 // : -5
x = -21/(-5)
x = 21/5
x = 21/5
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