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12-45x=12-45x
We move all terms to the left:
12-45x-(12-45x)=0
We add all the numbers together, and all the variables
-45x-(-45x+12)+12=0
We get rid of parentheses
-45x+45x-12+12=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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