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54=9-3x
We move all terms to the left:
54-(9-3x)=0
We add all the numbers together, and all the variables
-(-3x+9)+54=0
We get rid of parentheses
3x-9+54=0
We add all the numbers together, and all the variables
3x+45=0
We move all terms containing x to the left, all other terms to the right
3x=-45
x=-45/3
x=-15
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