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-3(z+14)=15
We move all terms to the left:
-3(z+14)-(15)=0
We multiply parentheses
-3z-42-15=0
We add all the numbers together, and all the variables
-3z-57=0
We move all terms containing z to the left, all other terms to the right
-3z=57
z=57/-3
z=-19
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