Respuesta :
perform indicated multiplication on left side to get:
30+6a-9=28a combine like terms on left side...
6a+21=28a subtract 21 from both sides...
6a=28a-21 subtract 28a from both sides...
-22a=-21 divide both sides by -22
a=21/22
30+6a-9=28a combine like terms on left side...
6a+21=28a subtract 21 from both sides...
6a=28a-21 subtract 28a from both sides...
-22a=-21 divide both sides by -22
a=21/22