Introductory Algebra for College Students (7th Edition)

$x=5$
A rational expression is undefined when the value of its denominator is zero. Write and solve an expression where the denominator is zero. $6x-30=0$ Add 30 to both sides. $6x-30+30=0+30$ Simplify. $6x=30$ Divide both sides by 6. $6x\div6=0\div6$ Simplify. $x=5$