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8z=-10z-9(-z+1)
We move all terms to the left:
8z-(-10z-9(-z+1))=0
We add all the numbers together, and all the variables
8z-(-10z-9(-1z+1))=0
We calculate terms in parentheses: -(-10z-9(-1z+1)), so:We get rid of parentheses
-10z-9(-1z+1)
We multiply parentheses
-10z+9z-9
We add all the numbers together, and all the variables
-1z-9
Back to the equation:
-(-1z-9)
8z+1z+9=0
We add all the numbers together, and all the variables
9z+9=0
We move all terms containing z to the left, all other terms to the right
9z=-9
z=-9/9
z=-1
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