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(x+2)^2-3(x+2)-40=0
We multiply parentheses
(x+2)^2-3x-6-40=0
We add all the numbers together, and all the variables
-3x+(x+2)^2-46=0
We move all terms containing x to the left, all other terms to the right
-3x+(x+2)^2=46
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