21+r=x

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Solution for 21+r=x equation: 


Simplifying
21 + r = x

Solving
21 + r = x

Solving for variable 'r'.

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

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

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

Simplifying
r = -21 + x

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