((7x+4)/(5x+4))+((3x+4)/(5x+4))

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Solution for ((7x+4)/(5x+4))+((3x+4)/(5x+4)) equation: 


D( x )

5*x+4 = 0

5*x+4 = 0

5*x+4 = 0

5*x+4 = 0 // - 4

5*x = -4 // : 5

x = -4/5

x in (-oo:-4/5) U (-4/5:+oo)

(7*x+4)/(5*x+4)+(3*x+4)/(5*x+4) = 0

7*x+3*x+4+4 = 0

10*x+8 = 0

(10*x+8)/(5*x+4) = 0

(10*x+8)/(5*x+4) = 0 // * 5*x+4

10*x+8 = 0

10*x+8 = 0 // - 8

10*x = -8 // : 10

x = -8/10

x = -4/5

x in { -4/5} 

x belongs to the empty set

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