3r+8=40-r

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Solution for 3r+8=40-r equation: 



3r+8=40-r

We move all terms to the left:

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

We add all the numbers together, and all the variables

3r-(-1r+40)+8=0

We get rid of parentheses

3r+1r-40+8=0

We add all the numbers together, and all the variables

4r-32=0

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

4r=32

r=32/4

r=8

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