30=120v/(v+60)

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Solution for 30=120v/(v+60) equation: 


D( v )

v+60 = 0

v+60 = 0

v+60 = 0

v+60 = 0 // - 60

v = -60

v in (-oo:-60) U (-60:+oo)

30 = (120*v)/(v+60) // - (120*v)/(v+60)

30-((120*v)/(v+60)) = 0

30-120*v*(v+60)^-1 = 0

(-120*v)/(v+60)+30 = 0

(-120*v)/(v+60)+(30*(v+60))/(v+60) = 0

30*(v+60)-120*v = 0

1800-90*v = 0

(1800-90*v)/(v+60) = 0

(1800-90*v)/(v+60) = 0 // * v+60

1800-90*v = 0

1800-90*v = 0 // - 1800

-90*v = -1800 // : -90

v = -1800/(-90)

v = 20

v = 20

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