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18\left(-7m+8n\right)\left(-8n-7m\right)
Multiply 2 and 9 to get 18.
\left(-126m+144n\right)\left(-8n-7m\right)
Use the distributive property to multiply 18 by -7m+8n.
1008mn+882m^{2}-1152n^{2}-1008nm
Apply the distributive property by multiplying each term of -126m+144n by each term of -8n-7m.
882m^{2}-1152n^{2}
Combine 1008mn and -1008nm to get 0.
18\left(-7m+8n\right)\left(-8n-7m\right)
Multiply 2 and 9 to get 18.
\left(-126m+144n\right)\left(-8n-7m\right)
Use the distributive property to multiply 18 by -7m+8n.
1008mn+882m^{2}-1152n^{2}-1008nm
Apply the distributive property by multiplying each term of -126m+144n by each term of -8n-7m.
882m^{2}-1152n^{2}
Combine 1008mn and -1008nm to get 0.