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-3.6-4z-8.5-2z=-5z-8.7
We move all terms to the left:
-3.6-4z-8.5-2z-(-5z-8.7)=0
We add all the numbers together, and all the variables
-6z-(-5z-8.7)-12.1=0
We get rid of parentheses
-6z+5z+8.7-12.1=0
We add all the numbers together, and all the variables
-1z-3.4=0
We move all terms containing z to the left, all other terms to the right
-z=3.4
z=3.4/-1
z=-3+0.4/1
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