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-2(7z-4)=50
We move all terms to the left:
-2(7z-4)-(50)=0
We multiply parentheses
-14z+8-50=0
We add all the numbers together, and all the variables
-14z-42=0
We move all terms containing z to the left, all other terms to the right
-14z=42
z=42/-14
z=-3
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