180=a+25+2a+40+55-a

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Solution for 180=a+25+2a+40+55-a equation: 



180=a+25+2a+40+55-a

We move all terms to the left:

180-(a+25+2a+40+55-a)=0

We add all the numbers together, and all the variables

-(2a+120)+180=0

We get rid of parentheses

-2a-120+180=0

We add all the numbers together, and all the variables

-2a+60=0

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

-2a=-60

a=-60/-2

a=+30

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