13-r=5

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Solution for 13-r=5 equation: 


Simplifying
13 + -1r = 5

Solving
13 + -1r = 5

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 + -1r = 5 + -13

Combine like terms: 13 + -13 = 0
0 + -1r = 5 + -13
-1r = 5 + -13

Combine like terms: 5 + -13 = -8
-1r = -8

Divide each side by '-1'.
r = 8

Simplifying
r = 8

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