-10r+21=-81

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Solution for -10r+21=-81 equation: 


Simplifying
-10r + 21 = -81

Reorder the terms:
21 + -10r = -81

Solving
21 + -10r = -81

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + -10r = -81 + -21

Combine like terms: 21 + -21 = 0
0 + -10r = -81 + -21
-10r = -81 + -21

Combine like terms: -81 + -21 = -102
-10r = -102

Divide each side by '-10'.
r = 10.2

Simplifying
r = 10.2

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