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The easy way to subject a higher number from a lower number is to reverse the operation and then add a negative sign.
a - b =
-b + a =
-(b-a)
Basically take the second number and subject the first number from it. Then add a negative sign in front of the number.
So for this problem:
6 - 55 = -55 + 6 = -(55-6) = -49
We took 55 (the first number) and subtracted 6 from it and got 49. Than we added a negative sign in front of the answer that we got and got -49.