(20r^2)=4r

Solution for (20r^2)=4r equation:

Simplifying
(20r2) = 4r

Solving
(20r2) = 4r

Solving for variable 'r'.

Reorder the terms:
-4r + (20r2) = 4r + -4r

Combine like terms: 4r + -4r = 0
-4r + (20r2) = 0

Factor out the Greatest Common Factor (GCF), '4r'.
4r(-1 + (5r)) = 0

Ignore the factor 4.
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 + (5r))' equal to zero and attempt to solve:

Simplifying
-1 + (5r) = 0

Solving
-1 + (5r) = 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 + (5r) = 0 + 1

Combine like terms: -1 + 1 = 0
0 + (5r) = 0 + 1
(5r) = 0 + 1

Combine like terms: 0 + 1 = 1
(5r) = 1

Divide each side by '5'.
r = 0.2

Simplifying
r = 0.2
Solution
r = {0, 0.2}