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1-z+0.5z^2=0
We add all the numbers together, and all the variables
0.5z^2-1z+1=0
a = 0.5; b = -1; c = +1;
Δ = b2-4ac
Δ = -12-4·0.5·1
Δ = -1
Delta is less than zero, so there is no solution for the equation
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