-4=-7(3+a)-10a

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Solution for -4=-7(3+a)-10a equation: 



-4=-7(3+a)-10a

We move all terms to the left:

-4-(-7(3+a)-10a)=0

We add all the numbers together, and all the variables

-(-7(a+3)-10a)-4=0



We calculate terms in parentheses: -(-7(a+3)-10a), so:

-7(a+3)-10a

We add all the numbers together, and all the variables

-10a-7(a+3)

We multiply parentheses

-10a-7a-21

We add all the numbers together, and all the variables

-17a-21

Back to the equation:

-(-17a-21)



We get rid of parentheses

17a+21-4=0

We add all the numbers together, and all the variables

17a+17=0

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

17a=-17

a=-17/17

a=-1

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