-105=-3(-7+8a)-6

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Solution for -105=-3(-7+8a)-6 equation: 



-105=-3(-7+8a)-6

We move all terms to the left:

-105-(-3(-7+8a)-6)=0

We add all the numbers together, and all the variables

-(-3(8a-7)-6)-105=0



We calculate terms in parentheses: -(-3(8a-7)-6), so:

-3(8a-7)-6

We multiply parentheses

-24a+21-6

We add all the numbers together, and all the variables

-24a+15

Back to the equation:

-(-24a+15)



We get rid of parentheses

24a-15-105=0

We add all the numbers together, and all the variables

24a-120=0

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

24a=120

a=120/24

a=5

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