When we’re on the left side of zero on the numberline then order of calculations again doesn’t matter, right?
-10 - 2 = -12
-2 - 10 = -12
It’s kind of confusing because minus is sometimes an operator and sometimes something like a modifier that says take the value and mirror it across zero… 
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Hi,
You are right. Maybe it helps to imagine that we are dealing with a summation.
a + b = c
b + a = c
a = -10
b = -2
c = -12
(-10) + (-2) = -12
(-2) + (-10) = -12
a + b = c
a + b + (-c) = 0
a + b - c = 0
(-10) + (-2) + (- -12) = 0
(-10) + (-2) + (+12) = 0
(-10) + (-2) + 12 = 0
Does that make sense?
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