6=-3(a-7)

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



6=-3(a-7)

We move all terms to the left:

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



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

-3(a-7)

We multiply parentheses

-3a+21

Back to the equation:

-(-3a+21)



We get rid of parentheses

3a-21+6=0

We add all the numbers together, and all the variables

3a-15=0

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

3a=15

a=15/3

a=5

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