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a in (-oo:+oo)
4*(1-1*a) = -24 // + 24
4*(1-1*a)+24 = 0
4*(1-a)+24 = 0
4*(1-a)+24 = 0
28-4*a = 0
28-4*a = 0
28-4*a = 0 // - 28
-4*a = -28 // : -4
a = -28/(-4)
a = 7
a = 7
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