3r^2=-r

Solution for 3r^2=-r equation:

Simplifying
3r2 = -1r

Solving
3r2 = -1r

Solving for variable 'r'.

Reorder the terms:
r + 3r2 = -1r + r

Combine like terms: -1r + r = 0
r + 3r2 = 0

Factor out the Greatest Common Factor (GCF), 'r'.
r(1 + 3r) = 0

Subproblem 1
Set the factor 'r' equal to zero and attempt to solve:

Simplifying
r = 0

Solving
r = 0

Move all terms containing r to the left, all other terms to the right.

Simplifying
r = 0
Subproblem 2
Set the factor '(1 + 3r)' equal to zero and attempt to solve:

Simplifying
1 + 3r = 0

Solving
1 + 3r = 0

Move all terms containing r to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 3r = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3r = 0 + -1
3r = 0 + -1

Combine like terms: 0 + -1 = -1
3r = -1

Divide each side by '3'.
r = -0.3333333333

Simplifying
r = -0.3333333333
Solution
r = {0, -0.3333333333}