7/r=1/4

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Solution for 7/r=1/4 equation: 


D( r )

r = 0

r = 0

r = 0

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

7/r = 1/4 // - 1/4

7/r-(1/4) = 0

7/r-1/4 = 0

7*r^-1 = 1/4 // : 7

r^-1 = 1/28

-1 < 0

1/(r^1) = 1/28 // * r^1

1 = 1/28*r^1 // : 1/28

28 = r^1

r = 28

r = 28

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