"X-4" is not an equation. It's just a number. Its value depends on the value of 'X'.
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The question cannot be answered because:there is no equation to solve. It may be assumed that it is "= 1" but that is not certain.it is not clear whether the question refers to (-x)4 or -(x4).
if you are meaning 4x=38, then the answer is 9.5
2% (50 x4) / 100
solve it
If you solve such an equation for "y", you get an equation in the slope-intercept form.