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-7/2z=42
We move all terms to the left:
-7/2z-(42)=0
Domain of the equation: 2z!=0We multiply all the terms by the denominator
z!=0/2
z!=0
z∈R
-42*2z-7=0
Wy multiply elements
-84z-7=0
We move all terms containing z to the left, all other terms to the right
-84z=7
z=7/-84
z=-1/12
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