Question

If a+2a+3a =6b-12 and if b = 2 then what is the value of a ?

Answer 1

6a=6b-12
put b=2
6a=6(2)-12
6a=12-12
6a=0
a=0/6
a=0 is answer obtained

Answer 2

$b = 2 \\ then \: \\ a + 2a + 3a = 6(2) - 12 \\ 6a = 12 - 12 \\ 6a = 0 \\ a = \frac{0}{6} \\ a = 0$