## Geometry: Common Core (15th Edition)

$x=75$
$\overset\longrightarrow{AB}$ bisects $\angle RAN$ Use the definition of bisects. $m\angle RAB=m\angle BAN$ Substitution property. $x=2x-75$ Subtraction property of equality. (Subtract 2x) $-x=-75$ Multiplication property of equality. (Multply by -1) $x=75$