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11=z/4-15
We move all terms to the left:
11-(z/4-15)=0
We get rid of parentheses
-z/4+15+11=0
We multiply all the terms by the denominator
-z+15*4+11*4=0
We add all the numbers together, and all the variables
-1z+104=0
We move all terms containing z to the left, all other terms to the right
-z=-104
z=-104/-1
z=+104
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