r-7=13

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Solution for r-7=13 equation: 


Simplifying
r + -7 = 13

Reorder the terms:
-7 + r = 13

Solving
-7 + r = 13

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + r = 13 + 7

Combine like terms: -7 + 7 = 0
0 + r = 13 + 7
r = 13 + 7

Combine like terms: 13 + 7 = 20
r = 20

Simplifying
r = 20

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