Evaluate
10a-22b+147
Differentiate w.r.t. b
-22
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162-13b+10a-9b-15
Subtract 14 from 176 to get 162.
162-22b+10a-15
Combine -13b and -9b to get -22b.
147-22b+10a
Subtract 15 from 162 to get 147.
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