9r+21=156

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Solution for 9r+21=156 equation: 


Simplifying
9r + 21 = 156

Reorder the terms:
21 + 9r = 156

Solving
21 + 9r = 156

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 + 9r = 156 + -21

Combine like terms: 21 + -21 = 0
0 + 9r = 156 + -21
9r = 156 + -21

Combine like terms: 156 + -21 = 135
9r = 135

Divide each side by '9'.
r = 15

Simplifying
r = 15

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