12r+13=181-9r

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Solution for 12r+13=181-9r equation:


Simplifying
12r + 13 = 181 + -9r

Reorder the terms:
13 + 12r = 181 + -9r

Solving
13 + 12r = 181 + -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.
13 + 12r + 9r = 181 + -9r + 9r

Combine like terms: 12r + 9r = 21r
13 + 21r = 181 + -9r + 9r

Combine like terms: -9r + 9r = 0
13 + 21r = 181 + 0
13 + 21r = 181

Add '-13' to each side of the equation.
13 + -13 + 21r = 181 + -13

Combine like terms: 13 + -13 = 0
0 + 21r = 181 + -13
21r = 181 + -13

Combine like terms: 181 + -13 = 168
21r = 168

Divide each side by '21'.
r = 8

Simplifying
r = 8

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