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-9.2=2.5-3.9z
We move all terms to the left:
-9.2-(2.5-3.9z)=0
We add all the numbers together, and all the variables
-(-3.9z+2.5)-9.2=0
We get rid of parentheses
3.9z-2.5-9.2=0
We add all the numbers together, and all the variables
3.9z-11.7=0
We move all terms containing z to the left, all other terms to the right
3.9z=11.7
z=11.7/3.9
z=3
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