r+3=13

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Solution for r+3=13 equation: 


Simplifying
r + 3 = 13

Reorder the terms:
3 + r = 13

Solving
3 + r = 13

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 + r = 13 + -3

Combine like terms: 3 + -3 = 0
0 + r = 13 + -3
r = 13 + -3

Combine like terms: 13 + -3 = 10
r = 10

Simplifying
r = 10

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