r+9-12-2r=

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


Simplifying
r + 9 + -12 + -2r = 0

Reorder the terms:
9 + -12 + r + -2r = 0

Combine like terms: 9 + -12 = -3
-3 + r + -2r = 0

Combine like terms: r + -2r = -1r
-3 + -1r = 0

Solving
-3 + -1r = 0

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + -1r = 0 + 3

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

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

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

Simplifying
r = -3

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