x = the number
-x = the number's opposite
Equation:
x = 50 + (-x)
x = 50 - x
x + x = 50 - x + x
2x = 50
2x/2 = 50/2
x = 25
Plug-in 25 to x:
The number: x = 25
Number's opposite: -x = -(25) = -25
ANSWER: The number is 25.
Check:
-25 + 50 = 25
25 = 25
Click image below to view the number line that the equation represents.
