40/r=1

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Solution for 40/r=1 equation: 


D( r )

r = 0

r = 0

r = 0

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

40/r = 1 // - 1

40/r-1 = 0

40*r^-1 = 1 // : 40

r^-1 = 1/40

-1 < 0

1/(r^1) = 1/40 // * r^1

1 = 1/40*r^1 // : 1/40

40 = r^1

r = 40

r = 40

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