-18=-r-2r

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Solution for -18=-r-2r equation:


Simplifying
-18 = -1r + -2r

Combine like terms: -1r + -2r = -3r
-18 = -3r

Solving
-18 = -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
-18 + 3r = -3r + 3r

Combine like terms: -3r + 3r = 0
-18 + 3r = 0

Add '18' to each side of the equation.
-18 + 18 + 3r = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 3r = 0 + 18
3r = 0 + 18

Combine like terms: 0 + 18 = 18
3r = 18

Divide each side by '3'.
r = 6

Simplifying
r = 6

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