-9=-r

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Solution for -9=-r equation: 


Simplifying
-9 = -1r

Solving
-9 = -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 = -1r + r

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

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

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

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

Simplifying
r = 9

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