To solve this expression, we can use the order of operations (PEMDAS/BODMAS).

First, we need to perform the multiplications:
27 x 121 = 3,267
87 x 121 = 10,527
73 x 34 = 2,482

Now, we can substitute these values back into the expression:
3,267 - 10,527 + 2,482

Next, we perform the subtractions:
3,267 - 10,527 = -7,260
-7,260 + 2,482 = -4,778

Therefore, 27 x 121 - 87 x 121 + 73 x 34 equals -4,778.