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30+30a-5a\left(3a-1\right)
Use the distributive property to multiply 30 by 1+a.
30+30a-15a^{2}+5a
Use the distributive property to multiply -5a by 3a-1.
30+35a-15a^{2}
Combine 30a and 5a to get 35a.
30+30a-5a\left(3a-1\right)
Use the distributive property to multiply 30 by 1+a.
30+30a-15a^{2}+5a
Use the distributive property to multiply -5a by 3a-1.
30+35a-15a^{2}
Combine 30a and 5a to get 35a.