-15=3a+1-7

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Solution for -15=3a+1-7 equation: 



-15=3a+1-7

We move all terms to the left:

-15-(3a+1-7)=0

We add all the numbers together, and all the variables

-(3a-6)-15=0

We get rid of parentheses

-3a+6-15=0

We add all the numbers together, and all the variables

-3a-9=0

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

-3a=9

a=9/-3

a=-3

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