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(z^2-1.5z+0.75)=0
We get rid of parentheses
z^2-1.5z+0.75=0
a = 1; b = -1.5; c = +0.75;
Δ = b2-4ac
Δ = -1.52-4·1·0.75
Δ = -0.75
Delta is less than zero, so there is no solution for the equation
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