r=-8r-90

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Solution for r=-8r-90 equation: 


Simplifying
r = -8r + -90

Reorder the terms:
r = -90 + -8r

Solving
r = -90 + -8r

Solving for variable 'r'.

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

Add '8r' to each side of the equation.
r + 8r = -90 + -8r + 8r

Combine like terms: r + 8r = 9r
9r = -90 + -8r + 8r

Combine like terms: -8r + 8r = 0
9r = -90 + 0
9r = -90

Divide each side by '9'.
r = -10

Simplifying
r = -10

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