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Answer:
x=7
y=4
JKL=49°
Step-by-step explanation:
7x+131=180
or, 7x=180-131
or, 7x= 49
x= 7
99+131+7×7+11×7+y=360
or, 99+131+49+77+y=360
or, y= 360-356
y=4
JKL = 7x=7×7=49°