Evaluate
3+x_{4}+x_{3}-4x_{2}-6x
Differentiate w.r.t. x
-6
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x_{4}-4x_{2}-6x-1+x_{3}+4
Combine 2x_{2} and -6x_{2} to get -4x_{2}.
x_{4}-4x_{2}-6x+3+x_{3}
Add -1 and 4 to get 3.
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