Question 350679
{{{x + (x + 1) + (x + 2) + (x + 3) + (x + 4) = (x+x+x+x+x)+(1+2+3+4)}}}

{{{x + (x + 1) + (x + 2) + (x + 3) + (x + 4) = (5x)+(10)}}}
{{{x + (x + 1) + (x + 2) + (x + 3) + (x + 4) = 5(x+2)}}}
Which is a multiple of 5, hence divisible by 5.