-9=-r-18

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Solution for -9=-r-18 equation:


Simplifying
-9 = -1r + -18

Reorder the terms:
-9 = -18 + -1r

Solving
-9 = -18 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-9 + r = -18 + -1r + r

Combine like terms: -1r + r = 0
-9 + r = -18 + 0
-9 + r = -18

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

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

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

Simplifying
r = -9

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