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a in (-oo:+oo)
(2*a-4)/2+(a-4)/2 = a-5 // - a-5
(2*a-4)/2+(a-4)/2-a+5 = 0
(2*a-4)/2+(a-4)/2+(2*(-a))/2+(2*5)/2 = 0
2*a+a+2*(-a)+2*5-4-4 = 0
3*a-2*a-8+10 = 0
a-8+10 = 0
a+2 = 0
(a+2)/2 = 0
(a+2)/2 = 0 // * 2
a+2 = 0
a+2 = 0 // - 2
a = -2
a = -2
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