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a in (-oo:+oo)
5*(6-(5*a)) = -245 // + 245
5*(6-(5*a))+245 = 0
5*(6-5*a)+245 = 0
5*(6-5*a)+245 = 0
275-25*a = 0
275-25*a = 0
275-25*a = 0 // - 275
-25*a = -275 // : -25
a = -275/(-25)
a = 11
a = 11
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