Answer:
[tex]\mathsf {7a}[/tex]
Step-by-step explanation:
[tex]\textsf {Here, both terms contain the variable 'a'.}\\\textsf {Hence, they can be added together once the variable}\\\textsf {is taken as a common factor.}[/tex]
[tex]\implies \mathsf {2a + 5a}[/tex]
[tex]\implies \mathsf {a(2 + 5)}[/tex]
[tex]\implies \mathsf {7a}[/tex]
