math help needed

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the question is:

-3x-2z-7
if x=3 and z= -1

i did the the question and got the answer - 14 ....but the answer key that i got say -20....can anyone help me... with this plz....

  • math help needed -

    -3(3) -2(-1) - 7
    -9 +2 -7
    -7 - 7
    -14

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