The answer depends on what x is meant to represent. Without that information, the question is a waste of time.
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.75/x=.33
42
The answer will depend on what x is.
No, because 'x' is a variable.
Identities are "equations" that are always true. For example, the equation sin(x) = cos(x) is true for x = pi/4 + kpi radians where k is any integer [ = 45 + 180k degrees], but for any other value of x the equation is not true. By contrast, the equation sin2(x) + cos2(x) = 1 is true whatever the value of x. This is an identity.