r-12=-2r

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Solution for r-12=-2r equation:


Simplifying
r + -12 = -2r

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

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

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

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

Add '12' to each side of the equation.
-12 + 12 + 3r = 0 + 12

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

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

Divide each side by '3'.
r = 4

Simplifying
r = 4

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