-7=-1-3a

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



-7=-1-3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a+1-7=0

We add all the numbers together, and all the variables

3a-6=0

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

3a=6

a=6/3

a=2

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