Evaluate
-16a^{2}-2b
Factor
2\left(-8a^{2}-b\right)
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-16a^{2}-21b+19b
Combine 16a^{2} and -32a^{2} to get -16a^{2}.
-16a^{2}-2b
Combine -21b and 19b to get -2b.
-16a^{2}-2b
Multiply and combine like terms.
2\left(-8a^{2}-b\right)
Factor out 2.
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