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(F)=-F^2-12
We move all terms to the left:
(F)-(-F^2-12)=0
We get rid of parentheses
F^2+F+12=0
a = 1; b = 1; c = +12;
Δ = b2-4ac
Δ = 12-4·1·12
Δ = -47
Delta is less than zero, so there is no solution for the equation
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