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a in (-oo:+oo)
300 = (1200*(a+1))/24 // - (1200*(a+1))/24
300-((1200*(a+1))/24) = 0
300-50*(a+1) = 0
300-50*(a+1) = 0
250-50*a = 0
250-50*a = 0
250-50*a = 0 // - 250
-50*a = -250 // : -50
a = -250/(-50)
a = 5
a = 5
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