-40=-1+3a

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Solution for -40=-1+3a equation: 



-40=-1+3a

We move all terms to the left:

-40-(-1+3a)=0

We add all the numbers together, and all the variables

-(3a-1)-40=0

We get rid of parentheses

-3a+1-40=0

We add all the numbers together, and all the variables

-3a-39=0

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

-3a=39

a=39/-3

a=-13

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