From the answer to: I ask U Y U R N S.
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There is no numerical value for 'x' that can make this a true statement.
If an expression is true "for no value" of x, it means that there is no value you can substitute for x to make it true. For example, x=x+1 is true for no value of x, because x is always strictly less than x+1.
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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.
To find the missing value in the equation 32.45 x = 253.11, you would divide 253.11 by 32.45. This calculation gives you x = 7.8. Therefore, the missing value that makes the equation true is 7.8.