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 = 17
r = 17

Simplifying
r = 17

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