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47-9z=2(z-4)
We move all terms to the left:
47-9z-(2(z-4))=0
We calculate terms in parentheses: -(2(z-4)), so:We get rid of parentheses
2(z-4)
We multiply parentheses
2z-8
Back to the equation:
-(2z-8)
-9z-2z+8+47=0
We add all the numbers together, and all the variables
-11z+55=0
We move all terms containing z to the left, all other terms to the right
-11z=-55
z=-55/-11
z=+5
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