90+4a+2a=180

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Solution for 90+4a+2a=180 equation: 



90+4a+2a=180

We move all terms to the left:

90+4a+2a-(180)=0

We add all the numbers together, and all the variables

6a-90=0

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

6a=90

a=90/6

a=15

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