X Stands for Unknown was created on 1984-02-10.
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the curvy 'x' in maths stands for an unknown number. So 'x=2+3', doesn't tell us what x is, but we can work it out. (x=5 in this case)
"x" stands for any unknown or variable quantity; 3x means 3 times this quantity.
A variable
Four times the unknown number. Let's say the unknown number is x. x + 3x = 4x
The "x" means unknown.