Answer: a =
Explanation:
Use the distributive property to multiply 5 by a+6.
5a+30−2(a−9)+15(a−4)=0
Use the distributive property to multiply −2 by a−9.
5a+30−2a+18+15(a−4)=0
Combine 5a and −2a to get 3a.
3a+30+18+15(a−4)=0
Add 30 and 18 to get 48.
3a+48+15(a−4)=0
Use the distributive property to multiply 15 by a−4.
3a+48+15a−60=0
Combine 3a and 15a to get 18a.
18a+48−60=0
Subtract 60 from 48 to get −12.
18a−12=0
Add 12 to both sides. Anything plus zero gives itself.
18a=12
Divide both sides by 18.
a = 12/18
Reduce the fraction
12/18 to lowest terms by extracting and canceling out 6.
therefore, a= 2/3