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(-3.4z+1.1)-(2.3z+8.2)=
We move all terms to the left:
(-3.4z+1.1)-(2.3z+8.2)-()=0
We add all the numbers together, and all the variables
(-3.4z+1.1)-(2.3z+8.2)=0
We get rid of parentheses
-3.4z-2.3z+1.1-8.2=0
We add all the numbers together, and all the variables
-5.7z-7.1=0
We move all terms containing z to the left, all other terms to the right
-5.7z=7.1
z=7.1/-5.7
z=-1+1/4.0714285714286
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