Evaluate
15a^{2}-8b+7
Differentiate w.r.t. a
30a
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15a^{2}+7-6b-2b
Combine 8a^{2} and 7a^{2} to get 15a^{2}.
15a^{2}+7-8b
Combine -6b and -2b to get -8b.
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