Question 1077409
The two numbers n and n+1


{{{n(n+1)=21+3(n+1)}}}

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{{{n^2+n=21+3n+3}}}

{{{n^2-2n-24=0}}}

{{{(n-6)(n+4)=0}}}



{{{system(n=6,AND,n+1=7)}}}