-15=-7a-4a

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Solution for -15=-7a-4a equation: 



-15=-7a-4a

We move all terms to the left:

-15-(-7a-4a)=0

We add all the numbers together, and all the variables

-(-11a)-15=0

We get rid of parentheses

11a-15=0

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

11a=15

a=15/11

a=1+4/11

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