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