Respuesta :

Use substitution method

3a+9=54

3a+9-9=54-9

3a= 45

divide by 3

3a/3= 45/3

a= 15

Answer is a= 15

St2427

=3a+9=54

=3a=54-9

=3a=45

=a=45/3

therefore a=15

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