3r+8+r-5=31

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Solution for 3r+8+r-5=31 equation: 


Simplifying
3r + 8 + r + -5 = 31

Reorder the terms:
8 + -5 + 3r + r = 31

Combine like terms: 8 + -5 = 3
3 + 3r + r = 31

Combine like terms: 3r + r = 4r
3 + 4r = 31

Solving
3 + 4r = 31

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + 4r = 31 + -3

Combine like terms: 3 + -3 = 0
0 + 4r = 31 + -3
4r = 31 + -3

Combine like terms: 31 + -3 = 28
4r = 28

Divide each side by '4'.
r = 7

Simplifying
r = 7

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