-10+1+2r=9+4r

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Solution for -10+1+2r=9+4r equation: 



-10+1+2r=9+4r

We move all terms to the left:

-10+1+2r-(9+4r)=0

We add all the numbers together, and all the variables

2r-(4r+9)-10+1=0

We add all the numbers together, and all the variables

2r-(4r+9)-9=0

We get rid of parentheses

2r-4r-9-9=0

We add all the numbers together, and all the variables

-2r-18=0

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

-2r=18

r=18/-2

r=-9

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