R+8=21

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Solution for R+8=21 equation: 


Simplifying
R + 8 = 21

Reorder the terms:
8 + R = 21

Solving
8 + R = 21

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 = 21 + -8

Combine like terms: 8 + -8 = 0
0 + R = 21 + -8
R = 21 + -8

Combine like terms: 21 + -8 = 13
R = 13

Simplifying
R = 13

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