Question 680269
{{{x^2 + 2x + 1 = x+1}}}
{{{x^2 + 2x - x + 1 - 1 = 0}}}
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{{{x^2 + x = 0 }}}
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x(x+1)=0
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{{{highlight_green(x = 0)}}}
x+1=0, so {{{highlight_green(x = -1)}}}

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