X2+y2-y+1=0

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Solution for X2+y2-y+1=0 equation: 



X2+X2-X+1=0

We add all the numbers together, and all the variables

2X^2-1X+1=0

a = 2; b = -1; c = +1;
Δ = b2-4ac
Δ = -12-4·2·1
Δ = -7
Delta is less than zero, so there is no solution for the equation

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