(-3a)-(3a)=66

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Solution for (-3a)-(3a)=66 equation: 



(-3a)-(3a)=66

We move all terms to the left:

(-3a)-(3a)-(66)=0

We add all the numbers together, and all the variables

-3a+(-3a)-66=0

We get rid of parentheses

-3a-3a-66=0

We add all the numbers together, and all the variables

-6a-66=0

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

-6a=66

a=66/-6

a=-11

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