Evaluate
3a_{1}+bd+13d
Differentiate w.r.t. a_1
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2a_{1}+4d+bd+a_{1}+9d
Combine a_{1} and a_{1} to get 2a_{1}.
3a_{1}+4d+bd+9d
Combine 2a_{1} and a_{1} to get 3a_{1}.
3a_{1}+13d+bd
Combine 4d and 9d to get 13d.
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