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a in (-oo:+oo)
a-(4*a)-5 = -29 // + 29
a-(4*a)-5+29 = 0
a-4*a-5+29 = 0
24-3*a = 0 // - 24
-3*a = -24 // : -3
a = -24/(-3)
a = 8
a = 8
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