-3-3(7a+5)=-81

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Solution for -3-3(7a+5)=-81 equation: 



-3-3(7a+5)=-81

We move all terms to the left:

-3-3(7a+5)-(-81)=0

We add all the numbers together, and all the variables

-3(7a+5)+78=0

We multiply parentheses

-21a-15+78=0

We add all the numbers together, and all the variables

-21a+63=0

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

-21a=-63

a=-63/-21

a=+3

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