8r=9r-12

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Solution for 8r=9r-12 equation: 


Simplifying
8r = 9r + -12

Reorder the terms:
8r = -12 + 9r

Solving
8r = -12 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
8r + -9r = -12 + 9r + -9r

Combine like terms: 8r + -9r = -1r
-1r = -12 + 9r + -9r

Combine like terms: 9r + -9r = 0
-1r = -12 + 0
-1r = -12

Divide each side by '-1'.
r = 12

Simplifying
r = 12

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