@zavasterism

Write it normally, as a fraction, and then come back

@the_bopr

Nope. PEMDAS makes it 12/2(3) or 12/6 which is 2

@Vibe77Guy

12÷2a=

12
--------=18
2a

6/a=18
6=18a
6/18=a=1/3 ≠ (2+1)
So, no, the indicated answer is not correct. 

12÷2a= 6÷a = 2 when a = 3 = (2+1)