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Start with the given expression.
Set the denominator equal to zero.
Remember, dividing by 0 is undefined. So if we find values of "t" that make the denominator zero, then we must restrict those values.
Add 7 to both sides
Combine like terms on the right side
Divide both sides by 3 to isolate t
So this means that
makes the denominator
equal to zero.
So we MUST make the restriction
to avoid dividing by zero (since
makes the denominator equal to zero).