Răspuns:
3a= 2b= 6c= 4d
m.a (a,b,c) = 84 => a+b+c = 84* 3 = 252
=> 2a + 2b+ 2c = 2*252 = 504
<=> 2a+ 3a + 2c = 504 | *3
<=> 6a+ 9a + 6c = 1512 <=> 15a+ 3a = 1512
<=> 18a = 1512 => a = 1512/18 = 84
=> 3a = 252
=> 2b = 252 => b= 126
=> 6c= 252 => c= 42
=> 4d= 252 => d=63
