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9=3(z-8)-(-9)
We move all terms to the left:
9-(3(z-8)-(-9))=0
We calculate terms in parentheses: -(3(z-8)-(-9)), so:We get rid of parentheses
3(z-8)-(-9)
We add all the numbers together, and all the variables
3(z-8)+9
We multiply parentheses
3z-24+9
We add all the numbers together, and all the variables
3z-15
Back to the equation:
-(3z-15)
-3z+15+9=0
We add all the numbers together, and all the variables
-3z+24=0
We move all terms containing z to the left, all other terms to the right
-3z=-24
z=-24/-3
z=+8
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