12+1.50r=42

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Solution for 12+1.50r=42 equation: 



12+1.50r=42

We move all terms to the left:

12+1.50r-(42)=0

We add all the numbers together, and all the variables

1.50r-30=0

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

1.50r=30

r=30/1.50

r=20

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