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z/30+557=586
We move all terms to the left:
z/30+557-(586)=0
We add all the numbers together, and all the variables
z/30-29=0
We multiply all the terms by the denominator
z-29*30=0
We add all the numbers together, and all the variables
z-870=0
We move all terms containing z to the left, all other terms to the right
z=870
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