X/(x+21)*100=35

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Solution for X/(x+21)*100=35 equation: 


D( x )

x+21 = 0

x+21 = 0

x+21 = 0

x+21 = 0 // - 21

x = -21

x in (-oo:-21) U (-21:+oo)

100*(X/(x+21)) = 35 // - 35

100*(X/(x+21))-35 = 0

(100*X)/(x+21)-35 = 0

(100*X)/(x+21)+(-35*(x+21))/(x+21) = 0

100*X-35*(x+21) = 0

100*X-35*x-735 = 0

(100*X-35*x-735)/(x+21) = 0

(100*X-35*x-735)/(x+21) = 0 // * x+21

100*X-35*x-735 = 0

100*X-35*x-735 = 0 // - 100*X-735

-35*x = -(100*X-735) // : -35

x = (-(100*X-735))/(-35)

x = (735-(100*X))/(-35)

x = (735-(100*X))/(-35)

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