find the sum with explanation
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X+a+y = 180 ( angle sum property of triangle) .....EQ 1
b+c + y = 180 .......EQ 2
from EQ 1 and 2
X+a+y= b+c+y
X= b+c-a
b+c + y = 180 .......EQ 2
from EQ 1 and 2
X+a+y= b+c+y
X= b+c-a
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