8-3r=-r+12

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Solution for 8-3r=-r+12 equation:


Simplifying
8 + -3r = -1r + 12

Reorder the terms:
8 + -3r = 12 + -1r

Solving
8 + -3r = 12 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
8 + -3r + r = 12 + -1r + r

Combine like terms: -3r + r = -2r
8 + -2r = 12 + -1r + r

Combine like terms: -1r + r = 0
8 + -2r = 12 + 0
8 + -2r = 12

Add '-8' to each side of the equation.
8 + -8 + -2r = 12 + -8

Combine like terms: 8 + -8 = 0
0 + -2r = 12 + -8
-2r = 12 + -8

Combine like terms: 12 + -8 = 4
-2r = 4

Divide each side by '-2'.
r = -2

Simplifying
r = -2

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