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math help

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5x+10y +15z-15x+10y-5z+5x-10y-5z / (5x+10y+15z)-(15x+10y-5z)+(5x-10y-5z)

a. 1/3
b. 1
c. x+2y+z / x-2y+3z
d. x-2y-z / x+2y-3z
e. x-2y-z / x+2y+z

my answer is none of above,
is - 1/3,
I didn't know I done it wrong or the question is not correct

  • math help -

    5x+10y +15z-15x+10y-5z+5x-10y-5z
    = -5x+10y+5z
    = -5(x-2y-z)

    (5x+10y+15z)-(15x+10y-5z)+(5x-10y-5z)
    = -5(x+2y-3z)

    Looks like (d) to me

  • math help -

    thank you

  • math help -

    4 3/4 - 2 1/4 =

  • math help -

    2 1/2

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