80=r(2.5)

Solution for 80=r(2.5) equation:

Simplifying
80 = r(2.5)

Reorder the terms for easier multiplication:
80 = 2.5r

Solving
80 = 2.5r

Solving for variable 'r'.

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

Add '-2.5r' to each side of the equation.
80 + -2.5r = 2.5r + -2.5r

Combine like terms: 2.5r + -2.5r = 0.0
80 + -2.5r = 0.0

Add '-80' to each side of the equation.
80 + -80 + -2.5r = 0.0 + -80

Combine like terms: 80 + -80 = 0
0 + -2.5r = 0.0 + -80
-2.5r = 0.0 + -80

Combine like terms: 0.0 + -80 = -80
-2.5r = -80

Divide each side by '-2.5'.
r = 32

Simplifying
r = 32