Question

[ ( 6 x 2 : 12 - a : 12 ) : 1 + 9 : 3 ] x 6 - 24 = 0

Answer 1

[ [ 6* 2 / 12- a /12 ]/1 + 9 / 3 ]*6-24=0
[1-a/12+3]*6=26
1-a/12 +3 =4
1-a/12=1
a+12=0 ⇒a=0

Answer 2

[(6x2:12-a:12):1+9:3]x6-24=0_________ __=>[(12:12-a:12):1+3]x6=24_________ __=>(1-a:12):1+3=24:6______________ ___=>(1-a:12):1+3=4________________ ___=>(1-a:12):1=4-3________________ __=>(1-a:12):1=1___________________ ___=>1-a:12=1x1___________________ ___=>1-a:12=1_____________________ ___=>1=1+a:12____________________ ____=>1+a:12=1____________________ ___=>a:12=1-1____________________ ___=>a:12=0___a=0x12____a=0