-18=-r-8r

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Solution for -18=-r-8r equation:


Simplifying
-18 = -1r + -8r

Combine like terms: -1r + -8r = -9r
-18 = -9r

Solving
-18 = -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.
-18 + 9r = -9r + 9r

Combine like terms: -9r + 9r = 0
-18 + 9r = 0

Add '18' to each side of the equation.
-18 + 18 + 9r = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 9r = 0 + 18
9r = 0 + 18

Combine like terms: 0 + 18 = 18
9r = 18

Divide each side by '9'.
r = 2

Simplifying
r = 2

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