-3.9+r=-8.5

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Solution for -3.9+r=-8.5 equation: 


Simplifying
-3.9 + r = -8.5

Solving
-3.9 + r = -8.5

Solving for variable 'r'.

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

Add '3.9' to each side of the equation.
-3.9 + 3.9 + r = -8.5 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + r = -8.5 + 3.9
r = -8.5 + 3.9

Combine like terms: -8.5 + 3.9 = -4.6
r = -4.6

Simplifying
r = -4.6

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