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-7.7-6z-7.5-3z=-8z-8.5
We move all terms to the left:
-7.7-6z-7.5-3z-(-8z-8.5)=0
We add all the numbers together, and all the variables
-9z-(-8z-8.5)-15.2=0
We get rid of parentheses
-9z+8z+8.5-15.2=0
We add all the numbers together, and all the variables
-1z-6.7=0
We move all terms containing z to the left, all other terms to the right
-z=6.7
z=6.7/-1
z=-6+0.7/1
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