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a in (-oo:+oo)
200 = (600*(a+1))/24 // - (600*(a+1))/24
200-((600*(a+1))/24) = 0
200-25*(a+1) = 0
200-25*(a+1) = 0
175-25*a = 0
175-25*a = 0
175-25*a = 0 // - 175
-25*a = -175 // : -25
a = -175/(-25)
a = 7
a = 7
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