If you mean: 4(x-2) = 0 then 4x-8 = 0 and x = 2
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There is, unfortunately, n equation in the question: only an expression. An expression cannot be solved for a variable.
1x80, 2x40, 4x20, 5x16, 8x10
In expressions such as "x-y", both "x" and "y" can have any value. The value of "x-y" will depend on what the value of "x" and the value of "y" are.
If the reflection is over the x value, the x-value does not change.
The answer depends on the value of x, which is not given.