r+4=13

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Solution for r+4=13 equation: 


Simplifying
r + 4 = 13

Reorder the terms:
4 + r = 13

Solving
4 + r = 13

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + r = 13 + -4

Combine like terms: 4 + -4 = 0
0 + r = 13 + -4
r = 13 + -4

Combine like terms: 13 + -4 = 9
r = 9

Simplifying
r = 9

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