Question 1194383
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Usually,  people do not write in the problem description    DC = 6x + x.


Such writing is  {{{highlight(DEFINITELY)}}}  a  {{{highlight(SIGN)}}}  of  {{{highlight(ERROR)}}}.



And when a tutor detects an error in the visitor's writing,

the duty of the tutor is to inform the visitor about the error,

BUT  DO  NOT  SOLVE  incorrectly posed problem,  as  @MathLover1 does.



It is an elementary rule of the safety precautions.