-3a-13=-3(a+3)-4

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Solution for -3a-13=-3(a+3)-4 equation: 



-3a-13=-3(a+3)-4

We move all terms to the left:

-3a-13-(-3(a+3)-4)=0



We calculate terms in parentheses: -(-3(a+3)-4), so:

-3(a+3)-4

We multiply parentheses

-3a-9-4

We add all the numbers together, and all the variables

-3a-13

Back to the equation:

-(-3a-13)



We get rid of parentheses

-3a+3a+13-13=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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