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16+7x^2=9
We move all terms to the left:
16+7x^2-(9)=0
We add all the numbers together, and all the variables
7x^2+7=0
a = 7; b = 0; c = +7;
Δ = b2-4ac
Δ = 02-4·7·7
Δ = -196
Delta is less than zero, so there is no solution for the equation
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