3r2-8r+7=0

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Solution for 3r2-8r+7=0 equation: 



3r^2-8r+7=0

a = 3; b = -8; c = +7;
Δ = b2-4ac
Δ = -82-4·3·7
Δ = -20
Delta is less than zero, so there is no solution for the equation

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