3r+12-8r=42

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Solution for 3r+12-8r=42 equation: 



3r+12-8r=42

We move all terms to the left:

3r+12-8r-(42)=0

We add all the numbers together, and all the variables

-5r-30=0

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

-5r=30

r=30/-5

r=-6

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