21+3r=48

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Solution for 21+3r=48 equation: 


Simplifying
21 + 3r = 48

Solving
21 + 3r = 48

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 + 3r = 48 + -21

Combine like terms: 21 + -21 = 0
0 + 3r = 48 + -21
3r = 48 + -21

Combine like terms: 48 + -21 = 27
3r = 27

Divide each side by '3'.
r = 9

Simplifying
r = 9

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