-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 = 12.4
r = 12.4

Simplifying
r = 12.4

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