21a+30=180

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Solution for 21a+30=180 equation: 



21a+30=180

We move all terms to the left:

21a+30-(180)=0

We add all the numbers together, and all the variables

21a-150=0

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

21a=150

a=150/21

a=7+1/7

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