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(x+2)(-x+1+x-4)=0
We add all the numbers together, and all the variables
(x+2)(-3)=0
We multiply parentheses ..
(-3x-6)=0
We get rid of parentheses
-3x-6=0
We move all terms containing x to the left, all other terms to the right
-3x=6
x=6/-3
x=-2
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