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z^2-14z+49=-81
We move all terms to the left:
z^2-14z+49-(-81)=0
We add all the numbers together, and all the variables
z^2-14z+130=0
a = 1; b = -14; c = +130;
Δ = b2-4ac
Δ = -142-4·1·130
Δ = -324
Delta is less than zero, so there is no solution for the equation
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