4r-8=40

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Solution for 4r-8=40 equation: 



4r-8=40

We move all terms to the left:

4r-8-(40)=0

We add all the numbers together, and all the variables

4r-48=0

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

4r=48

r=48/4

r=12

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