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z/2.3-4=21
We move all terms to the left:
z/2.3-4-(21)=0
We add all the numbers together, and all the variables
z/2.3-25=0
We multiply all the terms by the denominator
z-25*2.3=0
We add all the numbers together, and all the variables
z-57.5=0
We move all terms containing z to the left, all other terms to the right
z=57.5
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