Answer:
x= 10
YZ=60
Explanation:
X____Y____Z
XZ= XY+YZ
81 = (2x+1) + 6x
81 = 8x +1
8x = 81 -1
8x =80
x = 80/8
x = 10
YZ = 6x = 6(10) = 60
I hope I helped you^_^
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