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45-3x=45-3x
We move all terms to the left:
45-3x-(45-3x)=0
We add all the numbers together, and all the variables
-3x-(-3x+45)+45=0
We get rid of parentheses
-3x+3x-45+45=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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