-66=4+7a

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Solution for -66=4+7a equation: 



-66=4+7a

We move all terms to the left:

-66-(4+7a)=0

We add all the numbers together, and all the variables

-(7a+4)-66=0

We get rid of parentheses

-7a-4-66=0

We add all the numbers together, and all the variables

-7a-70=0

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

-7a=70

a=70/-7

a=-10

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