7/8=12/r

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Solution for 7/8=12/r equation: 


D( r )

r = 0

r = 0

r = 0

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

7/8 = 12/r // - 12/r

7/8-(12/r) = 0

7/8-12*r^-1 = 0

-12*r^-1 = -7/8 // : -12

r^-1 = 7/96

-1 < 0

1/(r^1) = 7/96 // * r^1

1 = 7/96*r^1 // : 7/96

96/7 = r^1

r = 96/7

r = 96/7

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