21/15=7/r

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Solution for 21/15=7/r equation: 


D( r )

r = 0

r = 0

r = 0

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

21/15 = 7/r // - 7/r

21/15-(7/r) = 0

21/15-7*r^-1 = 0

-7*r^-1 = -7/5 // : -7

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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