3r+12=-r+4

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Solution for 3r+12=-r+4 equation: 



3r+12=-r+4

We move all terms to the left:

3r+12-(-r+4)=0

We add all the numbers together, and all the variables

3r-(-1r+4)+12=0

We get rid of parentheses

3r+1r-4+12=0

We add all the numbers together, and all the variables

4r+8=0

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

4r=-8

r=-8/4

r=-2

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