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a in (-oo:+oo)
(1/2)*(4*a+10) = 2*a // - 2*a
(1/2)*(4*a+10)-(2*a) = 0
(1/2)*(4*a+10)-2*a = 0
1/2*(4*a+10)-2*a = 0
1/2*(4*a+10)-2*a = 0
5 = 0
5 = 0
a belongs to the empty set
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