100+4r=180

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Solution for 100+4r=180 equation: 


Simplifying
100 + 4r = 180

Solving
100 + 4r = 180

Solving for variable 'r'.

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

Add '-100' to each side of the equation.
100 + -100 + 4r = 180 + -100

Combine like terms: 100 + -100 = 0
0 + 4r = 180 + -100
4r = 180 + -100

Combine like terms: 180 + -100 = 80
4r = 80

Divide each side by '4'.
r = 20

Simplifying
r = 20

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