8.4/r=4

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Solution for 8.4/r=4 equation: 


D( r )

r = 0

r = 0

r = 0

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

8.4/r = 4 // - 4

8.4/r-4 = 0

8.4*r^-1 = 4 // : 8.4

r^-1 = 0.47619048

-1 < 0

1/(r^1) = 0.47619048 // * r^1

1 = 0.47619048*r^1 // : 0.47619048

2.09999998 = r^1

r = 2.09999998

r = 2.09999998

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