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19+z/2=22.5
We move all terms to the left:
19+z/2-(22.5)=0
We add all the numbers together, and all the variables
z/2-3.5=0
We multiply all the terms by the denominator
z-(3.5)*2=0
We add all the numbers together, and all the variables
z-7=0
We move all terms containing z to the left, all other terms to the right
z=7
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