7r2-14r=-7

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Solution for 7r2-14r=-7 equation: 



7r^2-14r=-7

We move all terms to the left:

7r^2-14r-(-7)=0

We add all the numbers together, and all the variables

7r^2-14r+7=0

a = 7; b = -14; c = +7;
Δ = b2-4ac
Δ = -142-4·7·7
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{14}{14}=1$

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