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-9z+z^2=3z+8z^2+9
We move all terms to the left:
-9z+z^2-(3z+8z^2+9)=0
We get rid of parentheses
z^2-8z^2-3z-9z-9=0
We add all the numbers together, and all the variables
-7z^2-12z-9=0
a = -7; b = -12; c = -9;
Δ = b2-4ac
Δ = -122-4·(-7)·(-9)
Δ = -108
Delta is less than zero, so there is no solution for the equation
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