The subtraction property of equality tells you that you can subtract the same value from ______ side of an equation to create an equivalent equation.
I believe the answer would be "each."
A general example(using n when subtracting):
a=a
so... a-n=a-n
A more specific example(using 1 when subtracting:
2+2=3+1
2+2-1=3+1-1
3=3