90+3a+a=180

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Solution for 90+3a+a=180 equation: 



90+3a+a=180

We move all terms to the left:

90+3a+a-(180)=0

We add all the numbers together, and all the variables

4a-90=0

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

4a=90

a=90/4

a=22+1/2

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