18r-10r-20r+2r+9r=20

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Solution for 18r-10r-20r+2r+9r=20 equation: 



18r-10r-20r+2r+9r=20

We move all terms to the left:

18r-10r-20r+2r+9r-(20)=0

We add all the numbers together, and all the variables

-1r-20=0

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

-r=20

r=20/-1

r=-20

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