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7r^2+9r+9=4
We move all terms to the left:
7r^2+9r+9-(4)=0
We add all the numbers together, and all the variables
7r^2+9r+5=0
a = 7; b = 9; c = +5;
Δ = b2-4ac
Δ = 92-4·7·5
Δ = -59
Delta is less than zero, so there is no solution for the equation
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