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11=3(z-8)-7
We move all terms to the left:
11-(3(z-8)-7)=0
We calculate terms in parentheses: -(3(z-8)-7), so:We get rid of parentheses
3(z-8)-7
We multiply parentheses
3z-24-7
We add all the numbers together, and all the variables
3z-31
Back to the equation:
-(3z-31)
-3z+31+11=0
We add all the numbers together, and all the variables
-3z+42=0
We move all terms containing z to the left, all other terms to the right
-3z=-42
z=-42/-3
z=+14
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