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-2a+3+3a=8-28
We move all terms to the left:
-2a+3+3a-(8-28)=0
We add all the numbers together, and all the variables
-2a+3a+3-(-20)=0
We add all the numbers together, and all the variables
a+23=0
We move all terms containing a to the left, all other terms to the right
a=-23
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