20r-10r=-10

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Solution for 20r-10r=-10 equation: 



20r-10r=-10

We move all terms to the left:

20r-10r-(-10)=0

We add all the numbers together, and all the variables

10r+10=0

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

10r=-10

r=-10/10

r=-1

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