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6=2.5+z
We move all terms to the left:
6-(2.5+z)=0
We add all the numbers together, and all the variables
-(z+2.5)+6=0
We get rid of parentheses
-z-2.5+6=0
We add all the numbers together, and all the variables
-1z+3.5=0
We move all terms containing z to the left, all other terms to the right
-z=-3.5
z=-3.5/-1
z=3+0.5/1
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