3+9/4=9/(x+4)

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Solution for 3+9/4=9/(x+4) equation: 


D( x )

x+4 = 0

x+4 = 0

x+4 = 0

x+4 = 0 // - 4

x = -4

x in (-oo:-4) U (-4:+oo)

9/4+3 = 9/(x+4) // - 9/(x+4)

9/4-(9/(x+4))+3 = 0

9/4-9*(x+4)^-1+3 = 0

9/4-9/(x+4)+3 = 0

(-9*4)/(4*(x+4))+(9*(x+4))/(4*(x+4))+(3*4*(x+4))/(4*(x+4)) = 0

9*(x+4)+3*4*(x+4)-9*4 = 0

9*x+12*x+48 = 0

21*x+48 = 0

(21*x+48)/(4*(x+4)) = 0

(21*x+48)/(4*(x+4)) = 0 // * 4*(x+4)

21*x+48 = 0

21*x+48 = 0 // - 48

21*x = -48 // : 21

x = -48/21

x = -16/7

x = -16/7

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