r-7/21=-1

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Solution for r-7/21=-1 equation: 



r-7/21=-1

We move all terms to the left:

r-7/21-(-1)=0

We add all the numbers together, and all the variables

r+1-7/21=0

We multiply all the terms by the denominator


r*21-7+1*21=0

We add all the numbers together, and all the variables

r*21+14=0

Wy multiply elements

21r+14=0

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

21r=-14

r=-14/21

r=-2/3

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