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9x^2+6x=-99
We move all terms to the left:
9x^2+6x-(-99)=0
We add all the numbers together, and all the variables
9x^2+6x+99=0
a = 9; b = 6; c = +99;
Δ = b2-4ac
Δ = 62-4·9·99
Δ = -3528
Delta is less than zero, so there is no solution for the equation
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