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8-10-7z=-9-6z
We move all terms to the left:
8-10-7z-(-9-6z)=0
We add all the numbers together, and all the variables
-7z-(-6z-9)+8-10=0
We add all the numbers together, and all the variables
-7z-(-6z-9)-2=0
We get rid of parentheses
-7z+6z+9-2=0
We add all the numbers together, and all the variables
-1z+7=0
We move all terms containing z to the left, all other terms to the right
-z=-7
z=-7/-1
z=+7
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