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(X+3)(2X+4)=2X^2+10X+12
We move all terms to the left:
(X+3)(2X+4)-(2X^2+10X+12)=0
We get rid of parentheses
-2X^2+(X+3)(2X+4)-10X-12=0
We multiply parentheses ..
-2X^2+(+2X^2+4X+6X+12)-10X-12=0
We get rid of parentheses
-2X^2+2X^2+4X+6X-10X+12-12=0
We add all the numbers together, and all the variables
=0
X=0/1
X=0
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