Answer :

AL2006
- 5a - 12 < -18

Add 12 to each side:

-5a < -6

Divide each side by 5 :

-a < -1.2

a > 1.2
[tex]-5a-12 < -18\ \ \ /+12\\\\-5a < -6\ \ \ \ /:(-5) < 0\ \then\ change\ " < " to\ " > "\\\\a > 1.2\\\\a\in(1.2;\ \infty)[/tex]
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