3r-8=31

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Solution for 3r-8=31 equation: 


Simplifying
3r + -8 = 31

Reorder the terms:
-8 + 3r = 31

Solving
-8 + 3r = 31

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + 3r = 31 + 8

Combine like terms: -8 + 8 = 0
0 + 3r = 31 + 8
3r = 31 + 8

Combine like terms: 31 + 8 = 39
3r = 39

Divide each side by '3'.
r = 13

Simplifying
r = 13

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