(a-15)+(a+5)+2a-20)+(180-a)=360

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Solution for (a-15)+(a+5)+2a-20)+(180-a)=360 equation: 



(a-15)+(a+5)+2a-20)+(180-a)=360

We move all terms to the left:

(a-15)+(a+5)+2a-20)+(180-a)-(360)=0

We add all the numbers together, and all the variables

2a+(a-15)+(a+5)-a)-360-20)+(180=0

We get rid of parentheses

2a+a+a-a)-360-20)+(180-15+5=0

We add all the numbers together, and all the variables

4a-a)-360-20)+(180-15+5=0

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