3(5+a)=21-5a

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Solution for 3(5+a)=21-5a equation: 



3(5+a)=21-5a

We move all terms to the left:

3(5+a)-(21-5a)=0

We add all the numbers together, and all the variables

3(a+5)-(-5a+21)=0

We multiply parentheses

3a-(-5a+21)+15=0

We get rid of parentheses

3a+5a-21+15=0

We add all the numbers together, and all the variables

8a-6=0

We move all terms containing a to the left, all other terms to the right

8a=6

a=6/8

a=3/4

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