40=3r+8-7r

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Solution for 40=3r+8-7r equation: 



40=3r+8-7r

We move all terms to the left:

40-(3r+8-7r)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4r-8+40=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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