Answer :

3a + 12 = 6a - 24
12 + 24 = 6a - 3a
3a = 36
a = 36/3
a = 12
partharoy
3a+12= 6a-24
     -12=     -12
3a      =  6a-36
-6a     =  -6a-36
-3a     = -6a-36         then divide by both side by -3
  a = 12
Ans: a=12

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