a is the coefficient of the squared element, b is the coefficient of the variable (x or in this case r), and c is the constant.

| First move the constant to the left by adding 3 to both sides.

| Factor out any common factor. In this case it's 3.

{{3{r^2 - 2r + 1 = 0}}} | The removed factor drops because 3 = 0 is never true.

| Now apply the quadratic formula.

= =

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