2r-3.1=21.7

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Solution for 2r-3.1=21.7 equation: 


Simplifying
2r + -3.1 = 21.7

Reorder the terms:
-3.1 + 2r = 21.7

Solving
-3.1 + 2r = 21.7

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 = 21.7 + 3.1

Combine like terms: -3.1 + 3.1 = 0.0
0.0 + 2r = 21.7 + 3.1
2r = 21.7 + 3.1

Combine like terms: 21.7 + 3.1 = 24.8
2r = 24.8

Divide each side by '2'.
r = 12.4

Simplifying
r = 12.4

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