9+12r=11r+20

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Solution for 9+12r=11r+20 equation:


Simplifying
9 + 12r = 11r + 20

Reorder the terms:
9 + 12r = 20 + 11r

Solving
9 + 12r = 20 + 11r

Solving for variable 'r'.

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

Add '-11r' to each side of the equation.
9 + 12r + -11r = 20 + 11r + -11r

Combine like terms: 12r + -11r = 1r
9 + 1r = 20 + 11r + -11r

Combine like terms: 11r + -11r = 0
9 + 1r = 20 + 0
9 + 1r = 20

Add '-9' to each side of the equation.
9 + -9 + 1r = 20 + -9

Combine like terms: 9 + -9 = 0
0 + 1r = 20 + -9
1r = 20 + -9

Combine like terms: 20 + -9 = 11
1r = 11

Divide each side by '1'.
r = 11

Simplifying
r = 11

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