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=16H^2+72
We move all terms to the left:
-(16H^2+72)=0
We get rid of parentheses
-16H^2-72=0
a = -16; b = 0; c = -72;
Δ = b2-4ac
Δ = 02-4·(-16)·(-72)
Δ = -4608
Delta is less than zero, so there is no solution for the equation
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