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33=12+7x
We move all terms to the left:
33-(12+7x)=0
We add all the numbers together, and all the variables
-(7x+12)+33=0
We get rid of parentheses
-7x-12+33=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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