Use the Addition and the Substitution Properties of Equality.
The Addition Property of Equality states that for any real numbers
So, to isolate
to each side.
By the Substitution Property of Equality,
Write the original equation and substitute the value of
The original equation is,
To check the solution, substitute –
in the equation.
Subtract. We get:
The equation is true.
So, the solution is –
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