132=3(-5-7a)

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Solution for 132=3(-5-7a) equation: 



132=3(-5-7a)

We move all terms to the left:

132-(3(-5-7a))=0

We add all the numbers together, and all the variables

-(3(-7a-5))+132=0



We calculate terms in parentheses: -(3(-7a-5)), so:

3(-7a-5)

We multiply parentheses

-21a-15

Back to the equation:

-(-21a-15)



We get rid of parentheses

21a+15+132=0

We add all the numbers together, and all the variables

21a+147=0

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

21a=-147

a=-147/21

a=-7

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