-12-2r=r-9

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Solution for -12-2r=r-9 equation:


Simplifying
-12 + -2r = r + -9

Reorder the terms:
-12 + -2r = -9 + r

Solving
-12 + -2r = -9 + 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.
-12 + -2r + -1r = -9 + r + -1r

Combine like terms: -2r + -1r = -3r
-12 + -3r = -9 + r + -1r

Combine like terms: r + -1r = 0
-12 + -3r = -9 + 0
-12 + -3r = -9

Add '12' to each side of the equation.
-12 + 12 + -3r = -9 + 12

Combine like terms: -12 + 12 = 0
0 + -3r = -9 + 12
-3r = -9 + 12

Combine like terms: -9 + 12 = 3
-3r = 3

Divide each side by '-3'.
r = -1

Simplifying
r = -1

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