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4.2=z/0
We move all terms to the left:
4.2-(z/0)=0
We add all the numbers together, and all the variables
-(+z/0)+4.2=0
We get rid of parentheses
-z/0+4.2=0
We multiply all the terms by the denominator
-z+(4.2)*0=0
We add all the numbers together, and all the variables
-z=0
z=0/-1
z=0
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