What number is equal to its opposite?

The sum of any number and its opposite is 0. The sign of a number refers to whether the number is positive or negative, for example, the sign of -3.2 is negative, and the sign of 442 is positive. We may also write positive and negative numbers as fractions or mixed numbers.

X= 49; x = 4step 1: foilstep 2: equal both to 0step 3: find x individually