Answer:
[tex]27[/tex]
Step-by-step explanation:
We start by setting an equation. We have [tex]2x+x+9=90[/tex] which simplifies to [tex]3x+9=90[/tex]. Subtract [tex]9[/tex] from both sides leaves us to solve for x when [tex]3x=81[/tex] divide by [tex]3[/tex] on both sides, we get [tex]x=27[/tex].
<<NoIcE}}
