4r+9=81

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Solution for 4r+9=81 equation: 


Simplifying
4r + 9 = 81

Reorder the terms:
9 + 4r = 81

Solving
9 + 4r = 81

Solving for variable 'r'.

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

Add '-9' to each side of the equation.
9 + -9 + 4r = 81 + -9

Combine like terms: 9 + -9 = 0
0 + 4r = 81 + -9
4r = 81 + -9

Combine like terms: 81 + -9 = 72
4r = 72

Divide each side by '4'.
r = 18

Simplifying
r = 18

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