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16=7+3z
We move all terms to the left:
16-(7+3z)=0
We add all the numbers together, and all the variables
-(3z+7)+16=0
We get rid of parentheses
-3z-7+16=0
We add all the numbers together, and all the variables
-3z+9=0
We move all terms containing z to the left, all other terms to the right
-3z=-9
z=-9/-3
z=+3
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