21+2a=9

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Solution for 21+2a=9 equation: 



21+2a=9

We move all terms to the left:

21+2a-(9)=0

We add all the numbers together, and all the variables

2a+12=0

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

2a=-12

a=-12/2

a=-6

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