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is this good?

Works for me, but I'm pretty lenient when it comes to rigour.

a + (a+1) + (a+2) + (a+3) + (a+4) = 5a + 10 QED

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you dont think i need so many words?

That's right...and x+2 is neither here nor there....

5x +10 is already divisible by 5

The extra step is superfluous (really really superfluous)

oppinions ???

(a-2) + (a-1) + a + (a+1) + (a+2) = 5a QED

i like your induction @jhonyy9,
but it is long

so yes thank you but i think that is very very more ,,mathematically"
thematically
yes???

my method is a flow of implication of truth

sorry on the second understandably i wann writing acceptably
sorry

That is real good @estudier !