8r-4=-15+r+7+8r

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Solution for 8r-4=-15+r+7+8r equation: 



8r-4=-15+r+7+8r

We move all terms to the left:

8r-4-(-15+r+7+8r)=0

We add all the numbers together, and all the variables

8r-(9r-8)-4=0

We get rid of parentheses

8r-9r+8-4=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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