8r+11r-5r-12r=42

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Solution for 8r+11r-5r-12r=42 equation: 



8r+11r-5r-12r=42

We move all terms to the left:

8r+11r-5r-12r-(42)=0

We add all the numbers together, and all the variables

2r-42=0

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

2r=42

r=42/2

r=21

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