Question

Add: 13ab - 12p; 6ab - 8p​

Answer 1

13ab+6ab +(-12p) + (-8p)
19ab-12p-8p
Ans =19ab-20p

Answer 2

$\: \: \: \: \: \: 13 \: ab - 12p + 6ab \: \: - 8 p \\ = 19ab \: - 20p$

⇒19 ab - 20 p