x^2+2ax+a^2-x-a factorize
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x²+2ax+a²-x-a
=>(x²+a²+2ax)-(x+a)
=>(x+a)²-(x+a)
=>(x+a){(x+a)-1}
=>(x+a)(x+a-1)
@:-)
=>(x²+a²+2ax)-(x+a)
=>(x+a)²-(x+a)
=>(x+a){(x+a)-1}
=>(x+a)(x+a-1)
@:-)
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