12=-2r-12+8r

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Solution for 12=-2r-12+8r equation:


Simplifying
12 = -2r + -12 + 8r

Reorder the terms:
12 = -12 + -2r + 8r

Combine like terms: -2r + 8r = 6r
12 = -12 + 6r

Solving
12 = -12 + 6r

Solving for variable 'r'.

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

Add '-6r' to each side of the equation.
12 + -6r = -12 + 6r + -6r

Combine like terms: 6r + -6r = 0
12 + -6r = -12 + 0
12 + -6r = -12

Add '-12' to each side of the equation.
12 + -12 + -6r = -12 + -12

Combine like terms: 12 + -12 = 0
0 + -6r = -12 + -12
-6r = -12 + -12

Combine like terms: -12 + -12 = -24
-6r = -24

Divide each side by '-6'.
r = 4

Simplifying
r = 4

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