9 - 4 = 9 + (-4)
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If the opposite is meant to be the additive opposite and not the multiplicative opposite, then their sum is zero. The reason is that is what defines an additive opposite!
The expression for 175 is 175, the expression for 280 is 280! Are you sure you meant "expression"?
The answer depends on where opposite! Even if you could spell correctly, the answer would depend on whether you meant the additive opposite or the multiplicative opposite.
It depends on what is meant by "opposite". For the additive opposite: x = -x - 38 For the multiplicative opposite: x = 1/x - 38
here is subtraction problem... 9 - 4 = 5 here is an addition of the opposite 9 + -4 = 5 both these equations are true and mean the same thing. when you subtracted you are actually adding the negative of that number. the negative means to put a minus symbol in front of that number and that number is the amount of units it takes from below zero to get to zero.