-r+13=12

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Solution for -r+13=12 equation: 


Simplifying
-1r + 13 = 12

Reorder the terms:
13 + -1r = 12

Solving
13 + -1r = 12

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 = 12 + -13

Combine like terms: 13 + -13 = 0
0 + -1r = 12 + -13
-1r = 12 + -13

Combine like terms: 12 + -13 = -1
-1r = -1

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

Simplifying
r = 1

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