9-9=13r-12r

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Solution for 9-9=13r-12r equation: 


Simplifying
9 + -9 = 13r + -12r

Combine like terms: 9 + -9 = 0
0 = 13r + -12r

Combine like terms: 13r + -12r = 1r
0 = 1r

Solving
0 = 1r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
0 + -1r = 1r + -1r
Remove the zero:
-1r = 1r + -1r

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

Divide each side by '-1'.
r = 0

Simplifying
r = 0

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