r-8.1=0.4

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Solution for r-8.1=0.4 equation: 


Simplifying
r + -8.1 = 0.4

Reorder the terms:
-8.1 + r = 0.4

Solving
-8.1 + r = 0.4

Solving for variable 'r'.

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

Add '8.1' to each side of the equation.
-8.1 + 8.1 + r = 0.4 + 8.1

Combine like terms: -8.1 + 8.1 = 0.0
0.0 + r = 0.4 + 8.1
r = 0.4 + 8.1

Combine like terms: 0.4 + 8.1 = 8.5
r = 8.5

Simplifying
r = 8.5

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