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