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decreased means subtract
`is` mean equal sign
now just translate into math equation

|dw:1440425370538:dw|
x is a number

But what does the variable stand for that is what I'm asking

x is the number whatever that is :=)

I know the equation is x-10=2*x but what is x?????????

you could write in
"A number" instead of "x"
but people use short names in algebra

in fact when I see
x-10=2*x
I read that as "a number decreased by 10 is 2 times that number"