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a in (-oo:+oo)
1/479-(910199/4)-872 = a/3 // - a/3
1/479-(a/3)-(910199/4)-872 = 0
1/479-(a/3)-910199/4-872 = 0
-1/3*a-437656069/1916 = 0 // + 437656069/1916
-1/3*a = 437656069/1916 // : -1/3
a = 437656069/1916/(-1/3)
a = -1312968207/1916
a = -1312968207/1916
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