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9a-2=38-20
We move all terms to the left:
9a-2-(38-20)=0
We add all the numbers together, and all the variables
9a-2-18=0
We add all the numbers together, and all the variables
9a-20=0
We move all terms containing a to the left, all other terms to the right
9a=20
a=20/9
a=2+2/9
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