(a+18)+8a+45=180

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Solution for (a+18)+8a+45=180 equation: 



(a+18)+8a+45=180

We move all terms to the left:

(a+18)+8a+45-(180)=0

We add all the numbers together, and all the variables

8a+(a+18)-135=0

We get rid of parentheses

8a+a+18-135=0

We add all the numbers together, and all the variables

9a-117=0

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

9a=117

a=117/9

a=13

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