The answer depends on what you mean by "opposite": whether it is the additive inverse or the multiplicative inverse.
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It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.
The purpose of finding the opposite of a number is to find its absolute value. This is how much less or greater it is than zero and how much it needs to return to zero.
The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.
The answer depends on what you mean by the "opposite" of a number. A reciprocal is one type of opposite: it is 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