a+2a-18+90=180

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Solution for a+2a-18+90=180 equation: 



a+2a-18+90=180

We move all terms to the left:

a+2a-18+90-(180)=0

We add all the numbers together, and all the variables

3a-108=0

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

3a=108

a=108/3

a=36

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