Evaluate
2\left(an+d_{20}-6\right)
Factor
2\left(an+d_{20}-6\right)
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2d_{20}-12+\frac{8}{4}an
Multiply 2 and 6 to get 12.
2d_{20}-12+2an
Divide 8 by 4 to get 2.
2\left(d_{20}-6+an\right)
Factor out 2.
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