2r-9=31

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Solution for 2r-9=31 equation: 


Simplifying
2r + -9 = 31

Reorder the terms:
-9 + 2r = 31

Solving
-9 + 2r = 31

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 2r = 31 + 9

Combine like terms: -9 + 9 = 0
0 + 2r = 31 + 9
2r = 31 + 9

Combine like terms: 31 + 9 = 40
2r = 40

Divide each side by '2'.
r = 20

Simplifying
r = 20

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