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

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



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

We move all terms to the left:

a+25+2a+40+55-a-(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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