21+2a=6+5a

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Solution for 21+2a=6+5a equation: 



21+2a=6+5a

We move all terms to the left:

21+2a-(6+5a)=0

We add all the numbers together, and all the variables

2a-(5a+6)+21=0

We get rid of parentheses

2a-5a-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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