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a - 5a = - 4 a
7 + 9 = 16
so
(16-4a)/ (a-4)
-4 (a-4) / (a-4)
is
-4
i got 6+40/a-4
7 + 9 = 16
so
(16-4a)/ (a-4)
-4 (a-4) / (a-4)
is
-4