9r+3=21

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Solution for 9r+3=21 equation: 


Simplifying
9r + 3 = 21

Reorder the terms:
3 + 9r = 21

Solving
3 + 9r = 21

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + 9r = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 9r = 21 + -3
9r = 21 + -3

Combine like terms: 21 + -3 = 18
9r = 18

Divide each side by '9'.
r = 2

Simplifying
r = 2

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