r+8=20

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Solution for r+8=20 equation: 


Simplifying
r + 8 = 20

Reorder the terms:
8 + r = 20

Solving
8 + r = 20

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + r = 20 + -8

Combine like terms: 8 + -8 = 0
0 + r = 20 + -8
r = 20 + -8

Combine like terms: 20 + -8 = 12
r = 12

Simplifying
r = 12

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