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6a^2=-84
We move all terms to the left:
6a^2-(-84)=0
We add all the numbers together, and all the variables
6a^2+84=0
a = 6; b = 0; c = +84;
Δ = b2-4ac
Δ = 02-4·6·84
Δ = -2016
Delta is less than zero, so there is no solution for the equation
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