7a-15=a-3a-15

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Solution for 7a-15=a-3a-15 equation: 



7a-15=a-3a-15

We move all terms to the left:

7a-15-(a-3a-15)=0

We add all the numbers together, and all the variables

7a-(-2a-15)-15=0

We get rid of parentheses

7a+2a+15-15=0

We add all the numbers together, and all the variables

9a=0

a=0/9

a=0

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