10+r=-10-9r

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Solution for 10+r=-10-9r equation: 



10+r=-10-9r

We move all terms to the left:

10+r-(-10-9r)=0

We add all the numbers together, and all the variables

r-(-9r-10)+10=0

We get rid of parentheses

r+9r+10+10=0

We add all the numbers together, and all the variables

10r+20=0

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

10r=-20

r=-20/10

r=-2

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