8(r+3)=40

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Solution for 8(r+3)=40 equation: 



8(r+3)=40

We move all terms to the left:

8(r+3)-(40)=0

We multiply parentheses

8r+24-40=0

We add all the numbers together, and all the variables

8r-16=0

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

8r=16

r=16/8

r=2

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