r-13=2

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Solution for r-13=2 equation: 


Simplifying
r + -13 = 2

Reorder the terms:
-13 + r = 2

Solving
-13 + r = 2

Solving for variable 'r'.

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

Add '13' to each side of the equation.
-13 + 13 + r = 2 + 13

Combine like terms: -13 + 13 = 0
0 + r = 2 + 13
r = 2 + 13

Combine like terms: 2 + 13 = 15
r = 15

Simplifying
r = 15

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