Answer:
[tex]a = 0[/tex]
Step-by-step explanation:
On the right side of the = multiply -4 through
[tex] - 6a - 4 = - 4 - 28a[/tex]
add 28a and add 4 to both sides
[tex]28a - 6a = 4 - 4[/tex]
[tex]22a = 0[/tex]
divide both sides by 22
[tex]a = 0[/tex]
