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That add to 123?

Algebraically, X = number.

X + (X + 1) + (X + 2) = 123

gather terms on the left

3X + 3 = 123

subtract 3 from each side

3X = 120

divide each side by 3

X = 40

-------------------so

X + 1 = 41

X + 2 = 42

--------------------------add 40 + 41 + 42

= 123

----------

so the three numbers are

(40, 41, 42 )

-------------------

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