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1134x^{2}+1701x+441
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1134x^{2}+1701x+441
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21\left(6x+7\right)\left(9x+3\right)
Multiply 7 and 3 to get 21.
\left(126x+147\right)\left(9x+3\right)
Use the distributive property to multiply 21 by 6x+7.
1134x^{2}+378x+1323x+441
Apply the distributive property by multiplying each term of 126x+147 by each term of 9x+3.
1134x^{2}+1701x+441
Combine 378x and 1323x to get 1701x.
21\left(6x+7\right)\left(9x+3\right)
Multiply 7 and 3 to get 21.
\left(126x+147\right)\left(9x+3\right)
Use the distributive property to multiply 21 by 6x+7.
1134x^{2}+378x+1323x+441
Apply the distributive property by multiplying each term of 126x+147 by each term of 9x+3.
1134x^{2}+1701x+441
Combine 378x and 1323x to get 1701x.
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