r+28=13

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Solution for r+28=13 equation: 


Simplifying
r + 28 = 13

Reorder the terms:
28 + r = 13

Solving
28 + r = 13

Solving for variable 'r'.

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

Add '-28' to each side of the equation.
28 + -28 + r = 13 + -28

Combine like terms: 28 + -28 = 0
0 + r = 13 + -28
r = 13 + -28

Combine like terms: 13 + -28 = -15
r = -15

Simplifying
r = -15

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