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94=3+7z
We move all terms to the left:
94-(3+7z)=0
We add all the numbers together, and all the variables
-(7z+3)+94=0
We get rid of parentheses
-7z-3+94=0
We add all the numbers together, and all the variables
-7z+91=0
We move all terms containing z to the left, all other terms to the right
-7z=-91
z=-91/-7
z=+13
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