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<ABC = 180 - 3x
Δ ABC
44 + 180 - 4x + 180 - 3x = 180
-4x - 3x = 180 - 180 - 180 - 44
-7x = - 224
x = 32 (D)
ABC = 180 - 3x
44 + 180 - 4x + 180 - 3x = 180
-4x - 3x = 180 - 180 - 180 - 44
-7x = - 224
x = 32