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z/3+7=-57
We move all terms to the left:
z/3+7-(-57)=0
We add all the numbers together, and all the variables
z/3+64=0
We multiply all the terms by the denominator
z+64*3=0
We add all the numbers together, and all the variables
z+192=0
We move all terms containing z to the left, all other terms to the right
z=-192
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