12(-3)=r

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Solution for 12(-3)=r equation: 



12(-3)=r

We move all terms to the left:

12(-3)-(r)=0

We add all the numbers together, and all the variables

-1r-36=0

We move all terms containing r to the left, all other terms to the right

-r=36

r=36/-1

r=-36

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