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33=7-4a
We move all terms to the left:
33-(7-4a)=0
We add all the numbers together, and all the variables
-(-4a+7)+33=0
We get rid of parentheses
4a-7+33=0
We add all the numbers together, and all the variables
4a+26=0
We move all terms containing a to the left, all other terms to the right
4a=-26
a=-26/4
a=-6+1/2
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