10a+21=15-2a

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



10a+21=15-2a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

10a+2a-15+21=0

We add all the numbers together, and all the variables

12a+6=0

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

12a=-6

a=-6/12

a=-1/2

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