9(r-80)=81

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Solution for 9(r-80)=81 equation: 


Simplifying
9(r + -80) = 81

Reorder the terms:
9(-80 + r) = 81
(-80 * 9 + r * 9) = 81
(-720 + 9r) = 81

Solving
-720 + 9r = 81

Solving for variable 'r'.

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

Add '720' to each side of the equation.
-720 + 720 + 9r = 81 + 720

Combine like terms: -720 + 720 = 0
0 + 9r = 81 + 720
9r = 81 + 720

Combine like terms: 81 + 720 = 801
9r = 801

Divide each side by '9'.
r = 89

Simplifying
r = 89

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