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33=2a-4
We move all terms to the left:
33-(2a-4)=0
We get rid of parentheses
-2a+4+33=0
We add all the numbers together, and all the variables
-2a+37=0
We move all terms containing a to the left, all other terms to the right
-2a=-37
a=-37/-2
a=18+1/2
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