-r-3r=12

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Solution for -r-3r=12 equation: 


Simplifying
-1r + -3r = 12

Combine like terms: -1r + -3r = -4r
-4r = 12

Solving
-4r = 12

Solving for variable 'r'.

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

Divide each side by '-4'.
r = -3

Simplifying
r = -3

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