6a+12=21

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Solution for 6a+12=21 equation: 



6a+12=21

We move all terms to the left:

6a+12-(21)=0

We add all the numbers together, and all the variables

6a-9=0

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

6a=9

a=9/6

a=1+1/2

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