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12+z=z(z+1)/(z=10)
We move all terms to the left:
12+z-(z(z+1)/(z)=0
Domain of the equation: z+12!=0We multiply all the terms by the denominator
We move all terms containing z to the left, all other terms to the right
z!=-12
z∈R
z*z-(z(z+1)+12=0
Wy multiply elements
z^2-(z(z+1)+12=0
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