7a-15=21-3a

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Solution for 7a-15=21-3a equation: 



7a-15=21-3a

We move all terms to the left:

7a-15-(21-3a)=0

We add all the numbers together, and all the variables

7a-(-3a+21)-15=0

We get rid of parentheses

7a+3a-21-15=0

We add all the numbers together, and all the variables

10a-36=0

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

10a=36

a=36/10

a=3+3/5

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