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6=z/2.1
We move all terms to the left:
6-(z/2.1)=0
We add all the numbers together, and all the variables
-(+z/2.1)+6=0
We get rid of parentheses
-z/2.1+6=0
We multiply all the terms by the denominator
-z+6*2.1=0
We add all the numbers together, and all the variables
-1z+12.6=0
We move all terms containing z to the left, all other terms to the right
-z=-12.6
z=-12.6/-1
z=12+0.6/1
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