1+5r+8r=-15-3r

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Solution for 1+5r+8r=-15-3r equation: 



1+5r+8r=-15-3r

We move all terms to the left:

1+5r+8r-(-15-3r)=0

We add all the numbers together, and all the variables

5r+8r-(-3r-15)+1=0

We add all the numbers together, and all the variables

13r-(-3r-15)+1=0

We get rid of parentheses

13r+3r+15+1=0

We add all the numbers together, and all the variables

16r+16=0

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

16r=-16

r=-16/16

r=-1

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