10a+21=15-12a

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Solution for 10a+21=15-12a equation: 



10a+21=15-12a

We move all terms to the left:

10a+21-(15-12a)=0

We add all the numbers together, and all the variables

10a-(-12a+15)+21=0

We get rid of parentheses

10a+12a-15+21=0

We add all the numbers together, and all the variables

22a+6=0

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

22a=-6

a=-6/22

a=-3/11

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