3+5r=40

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Solution for 3+5r=40 equation: 



3+5r=40

We move all terms to the left:

3+5r-(40)=0

We add all the numbers together, and all the variables

5r-37=0

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

5r=37

r=37/5

r=7+2/5

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