r-0.4=-3.2

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Solution for r-0.4=-3.2 equation: 


Simplifying
r + -0.4 = -3.2

Reorder the terms:
-0.4 + r = -3.2

Solving
-0.4 + r = -3.2

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 = -3.2 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + r = -3.2 + 0.4
r = -3.2 + 0.4

Combine like terms: -3.2 + 0.4 = -2.8
r = -2.8

Simplifying
r = -2.8

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