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a in (-oo:+oo)
5*(10-5*a) = 175 // - 175
5*(10-5*a)-175 = 0
5*(10-5*a)-175 = 0
-25*a-125 = 0
-25*a-125 = 0
-25*a-125 = 0 // + 125
-25*a = 125 // : -25
a = 125/(-25)
a = -5
a = -5
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