r=1-3

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Solution for r=1-3 equation: 



r=1-3

We move all terms to the left:

r-(1-3)=0

We add all the numbers together, and all the variables

r-(-2)=0

We add all the numbers together, and all the variables

r+2=0

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

r=-2

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