Evaluate
b-60a
Differentiate w.r.t. a
-60
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14a-7b+5b-74a+3b
Combine 10a and 4a to get 14a.
14a-2b-74a+3b
Combine -7b and 5b to get -2b.
-60a-2b+3b
Combine 14a and -74a to get -60a.
-60a+b
Combine -2b and 3b to get b.
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