Giải thích các bước giải:
Ta có :
$\dfrac{x+6}{1005}+\dfrac{x+132}{471}+\dfrac{x+1008}{168}=-12$
$\to (\dfrac{x+6}{1005}+2)+(\dfrac{x+132}{471}+4)+(\dfrac{x+1008}{168}+6)=0$
$\to \dfrac{x+2016}{1005}+\dfrac{x+2016}{471}+\dfrac{x+2016}{168}=0$
$\to x=-2016$