2a+a+21+a=360

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Solution for 2a+a+21+a=360 equation: 



2a+a+21+a=360

We move all terms to the left:

2a+a+21+a-(360)=0

We add all the numbers together, and all the variables

4a-339=0

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

4a=339

a=339/4

a=84+3/4

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