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-7z=-5z-10
We move all terms to the left:
-7z-(-5z-10)=0
We get rid of parentheses
-7z+5z+10=0
We add all the numbers together, and all the variables
-2z+10=0
We move all terms containing z to the left, all other terms to the right
-2z=-10
z=-10/-2
z=+5
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