20-10r-3r=9r-200

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Solution for 20-10r-3r=9r-200 equation: 



20-10r-3r=9r-200

We move all terms to the left:

20-10r-3r-(9r-200)=0

We add all the numbers together, and all the variables

-13r-(9r-200)+20=0

We get rid of parentheses

-13r-9r+200+20=0

We add all the numbers together, and all the variables

-22r+220=0

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

-22r=-220

r=-220/-22

r=+10

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