20r-10r+-9r=-13

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Solution for 20r-10r+-9r=-13 equation: 



20r-10r+-9r=-13

We move all terms to the left:

20r-10r+-9r-(-13)=0

We add all the numbers together, and all the variables

r+13=0

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

r=-13

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