27a-28=21

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Solution for 27a-28=21 equation: 



27a-28=21

We move all terms to the left:

27a-28-(21)=0

We add all the numbers together, and all the variables

27a-49=0

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

27a=49

a=49/27

a=1+22/27

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