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a in (-oo:+oo)
5*(5-(5*a)) = -125 // + 125
5*(5-(5*a))+125 = 0
5*(5-5*a)+125 = 0
5*(5-5*a)+125 = 0
150-25*a = 0
150-25*a = 0
150-25*a = 0 // - 150
-25*a = -150 // : -25
a = -150/(-25)
a = 6
a = 6
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