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8r+7=-6r^2
We move all terms to the left:
8r+7-(-6r^2)=0
We get rid of parentheses
6r^2+8r+7=0
a = 6; b = 8; c = +7;
Δ = b2-4ac
Δ = 82-4·6·7
Δ = -104
Delta is less than zero, so there is no solution for the equation
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