2r-3.1=4

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Solution for 2r-3.1=4 equation: 


Simplifying
2r + -3.1 = 4

Reorder the terms:
-3.1 + 2r = 4

Solving
-3.1 + 2r = 4

Solving for variable 'r'.

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

Add '3.1' to each side of the equation.
-3.1 + 3.1 + 2r = 4 + 3.1

Combine like terms: -3.1 + 3.1 = 0.0
0.0 + 2r = 4 + 3.1
2r = 4 + 3.1

Combine like terms: 4 + 3.1 = 7.1
2r = 7.1

Divide each side by '2'.
r = 3.55

Simplifying
r = 3.55

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