(4+5a)+(a+7)=180

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Solution for (4+5a)+(a+7)=180 equation: 



(4+5a)+(a+7)=180

We move all terms to the left:

(4+5a)+(a+7)-(180)=0

We add all the numbers together, and all the variables

(5a+4)+(a+7)-180=0

We get rid of parentheses

5a+a+4+7-180=0

We add all the numbers together, and all the variables

6a-169=0

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

6a=169

a=169/6

a=28+1/6

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