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83+16=4z+7z
We move all terms to the left:
83+16-(4z+7z)=0
We add all the numbers together, and all the variables
-(+11z)+83+16=0
We add all the numbers together, and all the variables
-(+11z)+99=0
We get rid of parentheses
-11z+99=0
We move all terms containing z to the left, all other terms to the right
-11z=-99
z=-99/-11
z=+9
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