How do you solve this problem 3x+2 (x+4)=x-(x+2)

Umm.. just started this 2day and its not on my notes(p′︵‵。)

In the film, zeke the zombie slayer versus the zombies from space, zeke slayed 140 zombies. in the sequel, zeke the zombie slayer versus the zombies from space, part 2, he slayed 5% more zombies. how many zombies were slain by zeke in the sequel?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?