If we let x be the number then the expression is:
`{2x-3}/x^2` the numerator is the first part which is 3 less than twice the number
The denominator is the number squared.
Now substitute `x=-2` into the expression to get:
`{2(-2)-3}/{(-2)^2}` simplify numerator
`={-4-3}/{(-2)^2}` evaluate denominator
`={-4-3}/4` simplify numerator
`=-7/4`
The final value of the expression is `-7/4` .
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