r-0.8=8.1

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Solution for r-0.8=8.1 equation: 


Simplifying
r + -0.8 = 8.1

Reorder the terms:
-0.8 + r = 8.1

Solving
-0.8 + r = 8.1

Solving for variable 'r'.

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

Add '0.8' to each side of the equation.
-0.8 + 0.8 + r = 8.1 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + r = 8.1 + 0.8
r = 8.1 + 0.8

Combine like terms: 8.1 + 0.8 = 8.9
r = 8.9

Simplifying
r = 8.9

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