-13+9r+3+-1=10r-1

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Solution for -13+9r+3+-1=10r-1 equation: 



-13+9r+3+-1=10r-1

We move all terms to the left:

-13+9r+3+-1-(10r-1)=0

We add all the numbers together, and all the variables

9r-(10r-1)=0

We get rid of parentheses

9r-10r+1=0

We add all the numbers together, and all the variables

-1r+1=0

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

-r=-1

r=-1/-1

r=1

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