2a-15-a=21+10a

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Solution for 2a-15-a=21+10a equation: 



2a-15-a=21+10a

We move all terms to the left:

2a-15-a-(21+10a)=0

We add all the numbers together, and all the variables

2a-a-(10a+21)-15=0

We add all the numbers together, and all the variables

a-(10a+21)-15=0

We get rid of parentheses

a-10a-21-15=0

We add all the numbers together, and all the variables

-9a-36=0

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

-9a=36

a=36/-9

a=-4

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