r+100-20=5r

Solution for r+100-20=5r equation:

Simplifying
r + 100 + -20 = 5r

Reorder the terms:
100 + -20 + r = 5r

Combine like terms: 100 + -20 = 80
80 + r = 5r

Solving
80 + r = 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
80 + r + -5r = 5r + -5r

Combine like terms: r + -5r = -4r
80 + -4r = 5r + -5r

Combine like terms: 5r + -5r = 0
80 + -4r = 0

Add '-80' to each side of the equation.
80 + -80 + -4r = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -4r = 0 + -80
-4r = 0 + -80

Combine like terms: 0 + -80 = -80
-4r = -80

Divide each side by '-4'.
r = 20

Simplifying
r = 20