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a in (-oo:+oo)
4*(10-(4*a)) = 24 // - 24
4*(10-(4*a))-24 = 0
4*(10-4*a)-24 = 0
4*(10-4*a)-24 = 0
16-16*a = 0
16-16*a = 0
16-16*a = 0 // - 16
-16*a = -16 // : -16
a = -16/(-16)
a = 1
a = 1
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