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