6+4a=-15-3a

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Solution for 6+4a=-15-3a equation: 



6+4a=-15-3a

We move all terms to the left:

6+4a-(-15-3a)=0

We add all the numbers together, and all the variables

4a-(-3a-15)+6=0

We get rid of parentheses

4a+3a+15+6=0

We add all the numbers together, and all the variables

7a+21=0

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

7a=-21

a=-21/7

a=-3

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