.4r-.8=.4

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Solution for .4r-.8=.4 equation: 


Simplifying
0.4r + -0.8 = 0.4

Reorder the terms:
-0.8 + 0.4r = 0.4

Solving
-0.8 + 0.4r = 0.4

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 + 0.4r = 0.4 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 0.4r = 0.4 + 0.8
0.4r = 0.4 + 0.8

Combine like terms: 0.4 + 0.8 = 1.2
0.4r = 1.2

Divide each side by '0.4'.
r = 3

Simplifying
r = 3

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