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-16=a(0-4)(0+2)
We move all terms to the left:
-16-(a(0-4)(0+2))=0
We add all the numbers together, and all the variables
-(a(-4)2)-16=0
We calculate terms in parentheses: -(a(-4)2), so:We get rid of parentheses
a(-4)2
We multiply parentheses
-8a
Back to the equation:
-(-8a)
8a-16=0
We move all terms containing a to the left, all other terms to the right
8a=16
a=16/8
a=2
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