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a in (-oo:+oo)
(-1/2)*(4*a+2) = 5 // - 5
(-1/2)*(4*a+2)-5 = 0
-1/2*(4*a+2)-5 = 0
-1/2*(4*a+2)-5 = 0
-2*a-6 = 0
-2*a-6 = 0
-2*a-6 = 0 // + 6
-2*a = 6 // : -2
a = 6/(-2)
a = -3
a = -3
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