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a in (-oo:+oo)
4-a-((3/6)*a)-24 = 0
(-1/2)*a-a-24+4 = 0
-3/2*a-20 = 0 // + 20
-3/2*a = 20 // : -3/2
a = 20/(-3/2)
a = -40/3
a = -40/3
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