13r+42=81

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Solution for 13r+42=81 equation: 


Simplifying
13r + 42 = 81

Reorder the terms:
42 + 13r = 81

Solving
42 + 13r = 81

Solving for variable 'r'.

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

Add '-42' to each side of the equation.
42 + -42 + 13r = 81 + -42

Combine like terms: 42 + -42 = 0
0 + 13r = 81 + -42
13r = 81 + -42

Combine like terms: 81 + -42 = 39
13r = 39

Divide each side by '13'.
r = 3

Simplifying
r = 3

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