Which value of ris a solution to this equation?

21 + 3r = 48

r = (

Step-by-step explanation:

Solving: 21+3r=48 Solving for variable 'r'Move all terms containing r yo 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