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Here, we have 3/8x - 4.5
And, x = 4.0
Now, Substituting value of x in the above equation, we get
= 3/(8×4) - 4.5
= 3/32 - 4.5
= 0.09375−4.5
= −4.40625
Therefore, value of given expression is −4.40625 when x = 4 .