Answer:
[tex]x=28[/tex]
Step-by-step explanation:
[tex]we~know~ that~ all~ the~ angles ~in ~a ~triangle ~all~add ~up ~to ~180[/tex]° [tex]That ~means: x + ( 2x + 5 ) + ( 3x + 7 ) = 180.~Since~ addition~ is~ associative,\\~x + ( 2x + 5 ) + ( 3x + 7 ) = 180~ is ~the~ same ~as~ x + 2x + 5 + 3x + 7 = 180.[/tex]
[tex]Combining~ like~ terms,~ we ~get: 6x + 12 = 180.[/tex]
[tex]After~ we ~move~ 12~ to~ the~ other~ side~ so ~the~ x~ is~ iscolated,~ we~ get:\\\ 6x = 168.\\[/tex]
[tex]Dividing~ each~ side~ by~ 6 ~gets~ us ~to~: x = 28, ~so ~the~ answer~ to~ this~ question~ is D.\\[/tex]
[tex]Hope~this~helps!~Have~a~blessed~day~ahead![/tex]
[tex]-Isabelle~Williams[/tex]
