r=-9+2r

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Solution for r=-9+2r equation: 


Simplifying
r = -9 + 2r

Solving
r = -9 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
r + -2r = -9 + 2r + -2r

Combine like terms: r + -2r = -1r
-1r = -9 + 2r + -2r

Combine like terms: 2r + -2r = 0
-1r = -9 + 0
-1r = -9

Divide each side by '-1'.
r = 9

Simplifying
r = 9

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