R+8.5=21

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Solution for R+8.5=21 equation: 


Simplifying
R + 8.5 = 21

Reorder the terms:
8.5 + R = 21

Solving
8.5 + R = 21

Solving for variable 'R'.

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

Add '-8.5' to each side of the equation.
8.5 + -8.5 + R = 21 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + R = 21 + -8.5
R = 21 + -8.5

Combine like terms: 21 + -8.5 = 12.5
R = 12.5

Simplifying
R = 12.5

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