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middle term must be 10

okay so the the left would be negative and the right would be positive.

okay well i was thinking the 30/3 = the 10

(x-d) + x + (x+d) = 30
can you solve for either x or d?

i think we can solve the x.
the 3x= 30 so x=10, right?

yes
but you can't really determine what d is though.

but at least now you know why the x (the middle number) is 10.

you can probably guess and check for the other 2 numbers (that's what i did)

okay, let me try and ill get back to you on this in a little

GOT IT!
(10-8) +/* 10 +/* (10+8) +=30 * =360