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a in (-oo:+oo)
(a+2)/5 = a-2 // - a-2
(a+2)/5-a+2 = 0
(a+2)/5+(5*(-a))/5+(2*5)/5 = 0
a+5*(-a)+2*5+2 = 0
2-4*a+10 = 0
12-4*a = 0
(12-4*a)/5 = 0
(12-4*a)/5 = 0 // * 5
12-4*a = 0
12-4*a = 0 // - 12
-4*a = -12 // : -4
a = -12/(-4)
a = 3
a = 3
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