Question 1063995
If you list the first,few múltiples of 7, from smallest to greater,
7, 14, 21, 28, 35, ..... ,
you find that {{{highlight(21)}}} is a solution.
However, adding any multiple of {{{7*8=56}}}
would give you another solution.
{{{21+56=77}}} would be the only other reasonable solution.