Evaluate
63g+6g_{13}
Factor
3\left(21g+2g_{13}\right)
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6g_{13}-\left(-63g\right)
Multiply 7 and -9 to get -63.
6g_{13}+63g
The opposite of -63g is 63g.
3\left(2g_{13}+21g\right)
Factor out 3.
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