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-7-10z=-9z
We move all terms to the left:
-7-10z-(-9z)=0
We get rid of parentheses
-10z+9z-7=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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