15+4r=231

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Solution for 15+4r=231 equation: 


Simplifying
15 + 4r = 231

Solving
15 + 4r = 231

Solving for variable 'r'.

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

Add '-15' to each side of the equation.
15 + -15 + 4r = 231 + -15

Combine like terms: 15 + -15 = 0
0 + 4r = 231 + -15
4r = 231 + -15

Combine like terms: 231 + -15 = 216
4r = 216

Divide each side by '4'.
r = 54

Simplifying
r = 54

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