12-r=4r-2r

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Solution for 12-r=4r-2r equation:


Simplifying
12 + -1r = 4r + -2r

Combine like terms: 4r + -2r = 2r
12 + -1r = 2r

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

Combine like terms: -1r + -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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