Evaluate
2Tx+6x+x_{2}+24
Differentiate w.r.t. x
2\left(T+3\right)
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x_{2}+2xT+42+6x-18
Combine 3x and 3x to get 6x.
x_{2}+2xT+24+6x
Subtract 18 from 42 to get 24.
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