(3w-21)/(4)/(w-7)/(10w)

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Solution for (3w-21)/(4)/(w-7)/(10w) equation: 


D( w )

10*w = 0

w-7 = 0

10*w = 0

10*w = 0

10*w = 0 // : 10

w = 0

w-7 = 0

w-7 = 0

w-7 = 0 // + 7

w = 7

w in (-oo:0) U (0:7) U (7:+oo)

(((3*w-21)/4)/(w-7))/(10*w) = 0

(3*w-21)/(4*10*w*(w-7)) = 0

3*w-21 = 0 // + 21

3*w = 21 // : 3

w = 21/3

w = 7

w in { 7} 

w belongs to the empty set

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