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a in (-oo:+oo)
(1/5)*(5*a+25) = a+5 // - a+5
(1/5)*(5*a+25)-a-5 = 0
1/5*(5*a+25)-a-5 = 0
1/5*(5*a+25)-a-5 = 0
5-5 = 0
0 = 0
0 = 0
a belongs to the empty set
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