r-0.4=-13.1

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Solution for r-0.4=-13.1 equation: 


Simplifying
r + -0.4 = -13.1

Reorder the terms:
-0.4 + r = -13.1

Solving
-0.4 + r = -13.1

Solving for variable 'r'.

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

Add '0.4' to each side of the equation.
-0.4 + 0.4 + r = -13.1 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + r = -13.1 + 0.4
r = -13.1 + 0.4

Combine like terms: -13.1 + 0.4 = -12.7
r = -12.7

Simplifying
r = -12.7

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