4r+8r-5r+9r-8r=40

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Solution for 4r+8r-5r+9r-8r=40 equation: 



4r+8r-5r+9r-8r=40

We move all terms to the left:

4r+8r-5r+9r-8r-(40)=0

We add all the numbers together, and all the variables

8r-40=0

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

8r=40

r=40/8

r=5

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