15/(50+x)=21

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Solution for 15/(50+x)=21 equation: 


D( x )

x+50 = 0

x+50 = 0

x+50 = 0

x+50 = 0 // - 50

x = -50

x in (-oo:-50) U (-50:+oo)

15/(x+50) = 21 // - 21

15/(x+50)-21 = 0

15/(x+50)+(-21*(x+50))/(x+50) = 0

15-21*(x+50) = 0

-21*x-1035 = 0

(-21*x-1035)/(x+50) = 0

(-21*x-1035)/(x+50) = 0 // * x+50

-21*x-1035 = 0

-21*x-1035 = 0 // + 1035

-21*x = 1035 // : -21

x = 1035/(-21)

x = -345/7

x = -345/7

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