Answer :
4a + 3 - 9 = -7 + 2 + a
4a - 6 = -5 + a
4a - a = -5 + 6
3a = 1 / : 3
a = 1/3
4a - 6 = -5 + a
4a - a = -5 + 6
3a = 1 / : 3
a = 1/3
[tex]4a + 3 - 9 = -7 + 2 + a\\
4a-6=-5+a\\
4a-a=-5+6\\
3a=1\ /:3\\
a=\frac13[/tex]