3(2+a)=21

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Solution for 3(2+a)=21 equation: 



3(2+a)=21

We move all terms to the left:

3(2+a)-(21)=0

We add all the numbers together, and all the variables

3(a+2)-21=0

We multiply parentheses

3a+6-21=0

We add all the numbers together, and all the variables

3a-15=0

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

3a=15

a=15/3

a=5

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