Question

pls help me with my math 2.0

Answer 1

Answer:

x= 12 is the right answer

Answer 2

Step-by-step explanation:

-6x+12+3x=-3x-9+21

-6x+3x+3x=21-9-12

6x=21-(-21)

6x=42

x=42/6=7/1=7

But correct answer is option number a