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2a^{2}-2a-5a+5+\left(3a+4\right)\left(2a+1\right)-3
Apply the distributive property by multiplying each term of 2a-5 by each term of a-1.
2a^{2}-7a+5+\left(3a+4\right)\left(2a+1\right)-3
Combine -2a and -5a to get -7a.
2a^{2}-7a+5+6a^{2}+3a+8a+4-3
Apply the distributive property by multiplying each term of 3a+4 by each term of 2a+1.
2a^{2}-7a+5+6a^{2}+11a+4-3
Combine 3a and 8a to get 11a.
8a^{2}-7a+5+11a+4-3
Combine 2a^{2} and 6a^{2} to get 8a^{2}.
8a^{2}+4a+5+4-3
Combine -7a and 11a to get 4a.
8a^{2}+4a+9-3
Add 5 and 4 to get 9.
8a^{2}+4a+6
Subtract 3 from 9 to get 6.
2a^{2}-2a-5a+5+\left(3a+4\right)\left(2a+1\right)-3
Apply the distributive property by multiplying each term of 2a-5 by each term of a-1.
2a^{2}-7a+5+\left(3a+4\right)\left(2a+1\right)-3
Combine -2a and -5a to get -7a.
2a^{2}-7a+5+6a^{2}+3a+8a+4-3
Apply the distributive property by multiplying each term of 3a+4 by each term of 2a+1.
2a^{2}-7a+5+6a^{2}+11a+4-3
Combine 3a and 8a to get 11a.
8a^{2}-7a+5+11a+4-3
Combine 2a^{2} and 6a^{2} to get 8a^{2}.
8a^{2}+4a+5+4-3
Combine -7a and 11a to get 4a.
8a^{2}+4a+9-3
Add 5 and 4 to get 9.
8a^{2}+4a+6
Subtract 3 from 9 to get 6.