r+11+8r=20

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Solution for r+11+8r=20 equation:


Simplifying
r + 11 + 8r = 20

Reorder the terms:
11 + r + 8r = 20

Combine like terms: r + 8r = 9r
11 + 9r = 20

Solving
11 + 9r = 20

Solving for variable 'r'.

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

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

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

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

Divide each side by '9'.
r = 1

Simplifying
r = 1

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