Answer:

Step-by-step explanation:
pull like terms from the problem to re-arrange it into a product

I think the expression is
3t(5.4n + 1.8 )
<span> -5a^2-19a^2-5a-8+12a^2-22-14a-2a
first gather all same powers
-5a</span>²-19a²+12a²-5a-14a-2a-8-22
-12a²-21a-30
-3(6a²+7a-+10)
71/20 or 3.55 as a decimal