r=-9r-20

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Solution for r=-9r-20 equation: 


Simplifying
r = -9r + -20

Reorder the terms:
r = -20 + -9r

Solving
r = -20 + -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.
r + 9r = -20 + -9r + 9r

Combine like terms: r + 9r = 10r
10r = -20 + -9r + 9r

Combine like terms: -9r + 9r = 0
10r = -20 + 0
10r = -20

Divide each side by '10'.
r = -2

Simplifying
r = -2

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