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9=z/7-11
We move all terms to the left:
9-(z/7-11)=0
We get rid of parentheses
-z/7+11+9=0
We multiply all the terms by the denominator
-z+11*7+9*7=0
We add all the numbers together, and all the variables
-1z+140=0
We move all terms containing z to the left, all other terms to the right
-z=-140
z=-140/-1
z=+140
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