2/5=x/(21-x)

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Solution for 2/5=x/(21-x) equation: 


D( x )

21-x = 0

21-x = 0

21-x = 0

21-x = 0 // - 21

-x = -21 // * -1

x = 21

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

2/5 = x/(21-x) // - x/(21-x)

2/5-(x/(21-x)) = 0

(-1*x)/(21-x)+2/5 = 0

(-1*5*x)/(5*(21-x))+(2*(21-x))/(5*(21-x)) = 0

2*(21-x)-1*5*x = 0

42-7*x = 0

(42-7*x)/(5*(21-x)) = 0

(42-7*x)/(5*(21-x)) = 0 // * 5*(21-x)

42-7*x = 0

42-7*x = 0 // - 42

-7*x = -42 // : -7

x = -42/(-7)

x = 6

x = 6

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