r-18=21

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Solution for r-18=21 equation: 


Simplifying
r + -18 = 21

Reorder the terms:
-18 + r = 21

Solving
-18 + r = 21

Solving for variable 'r'.

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

Add '18' to each side of the equation.
-18 + 18 + r = 21 + 18

Combine like terms: -18 + 18 = 0
0 + r = 21 + 18
r = 21 + 18

Combine like terms: 21 + 18 = 39
r = 39

Simplifying
r = 39

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