21+r-8=5

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Solution for 21+r-8=5 equation: 


Simplifying
21 + r + -8 = 5

Reorder the terms:
21 + -8 + r = 5

Combine like terms: 21 + -8 = 13
13 + r = 5

Solving
13 + r = 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 + r = 5 + -13

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

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

Simplifying
r = -8

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