how to find the middle term of an even number
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multiple of last term and sum of first term
for example
x²+2x+1
x²+x+x+1
x(x+1) +1(x+1)
(x+1) (x+1)=0
x=-1,x=-1
for example
x²+2x+1
x²+x+x+1
x(x+1) +1(x+1)
(x+1) (x+1)=0
x=-1,x=-1
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