3r-9=12

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Solution for 3r-9=12 equation: 


Simplifying
3r + -9 = 12

Reorder the terms:
-9 + 3r = 12

Solving
-9 + 3r = 12

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 3r = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 3r = 12 + 9
3r = 12 + 9

Combine like terms: 12 + 9 = 21
3r = 21

Divide each side by '3'.
r = 7

Simplifying
r = 7

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