In ΔHIJ,
m
∠
H
=
(
3
x
+
12
)
∘
m∠H=(3x+12)
∘
,
m
∠
I
=
(
5
x
+
9
)
∘
m∠I=(5x+9)
∘
, and
m
∠
J
=
(
2
x
+
9
)
∘
m∠J=(2x+9)
∘
. Find
m
∠
I
.
m∠I