7/r-2/r=-1

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Solution for 7/r-2/r=-1 equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

7/r-(2/r) = -1 // + 1

7/r-(2/r)+1 = 0

7/r-2*r^-1+1 = 0

5*r^-1 = -1 // : 5

r^-1 = -1/5

-1 < 0

1/(r^1) = -1/5 // * r^1

1 = -1/5*r^1 // : -1/5

-5 = r^1

r = -5

r = -5

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