90+(5a+6)+(7a)=180

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Solution for 90+(5a+6)+(7a)=180 equation: 



90+(5a+6)+(7a)=180

We move all terms to the left:

90+(5a+6)+(7a)-(180)=0

We add all the numbers together, and all the variables

7a+(5a+6)-90=0

We get rid of parentheses

7a+5a+6-90=0

We add all the numbers together, and all the variables

12a-84=0

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

12a=84

a=84/12

a=7

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