Answer:
Its -7
Explanation:
1st Triangle
XY=8
YZ=10
ZX=12
Total sum of Triangle
=8+10+12
=20
2nd Triangle
LM=12
MN=15
NL=?
Total sum of triange
LM+MN+NL=Total sum of 1st triangle
=12+15+x=20
=27+x=20
=x=20-27
x=-7
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