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Vilka [71]
3 years ago
13

Anyone know this?? Thanks

Mathematics
1 answer:
xz_007 [3.2K]3 years ago
8 0

9514 1404 393

Answer:

  x = 4

Step-by-step explanation:

The figure is a rhombus when the sides are the same length.

  21 -x = 2x +9

  12 = 3x . . . . . . . . add x-9 to both sides

  4 = x . . . . . . . . . . divide by 3

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