13-r-1=10+1

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Solution for 13-r-1=10+1 equation: 


Simplifying
13 + -1r + -1 = 10 + 1

Reorder the terms:
13 + -1 + -1r = 10 + 1

Combine like terms: 13 + -1 = 12
12 + -1r = 10 + 1

Combine like terms: 10 + 1 = 11
12 + -1r = 11

Solving
12 + -1r = 11

Solving for variable 'r'.

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

Add '-12' to each side of the equation.
12 + -12 + -1r = 11 + -12

Combine like terms: 12 + -12 = 0
0 + -1r = 11 + -12
-1r = 11 + -12

Combine like terms: 11 + -12 = -1
-1r = -1

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

Simplifying
r = 1

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