25r^2-9f^2=0

Solution for 25r^2-9f^2=0 equation:

Simplifying
25r2 + -9f2 = 0

Reorder the terms:
-9f2 + 25r2 = 0

Solving
-9f2 + 25r2 = 0

Solving for variable 'f'.

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

Add '-25r2' to each side of the equation.
-9f2 + 25r2 + -25r2 = 0 + -25r2

Combine like terms: 25r2 + -25r2 = 0
-9f2 + 0 = 0 + -25r2
-9f2 = 0 + -25r2
Remove the zero:
-9f2 = -25r2

Divide each side by '-9'.
f2 = 2.777777778r2

Simplifying
f2 = 2.777777778r2

Take the square root of each side:
f = {-1.666666667r, 1.666666667r}