-r=r-18

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Solution for -r=r-18 equation:


Simplifying
-1r = r + -18

Reorder the terms:
-1r = -18 + r

Solving
-1r = -18 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-1r + -1r = -18 + r + -1r

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

Combine like terms: r + -1r = 0
-2r = -18 + 0
-2r = -18

Divide each side by '-2'.
r = 9

Simplifying
r = 9

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