(5a+15)+(2a+25)=180

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Solution for (5a+15)+(2a+25)=180 equation: 



(5a+15)+(2a+25)=180

We move all terms to the left:

(5a+15)+(2a+25)-(180)=0

We get rid of parentheses

5a+2a+15+25-180=0

We add all the numbers together, and all the variables

7a-140=0

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

7a=140

a=140/7

a=20

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