(2x+1) (2x+3) - (x-4) (2x+1)
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=(4x^2+6x+2x+3x)-(2x^2+x-8x^2-4)
=(4x^2+11x)-(6x^2+x-4)
=4x^2+11x-6x^2-x+4
=-2x^2+10x+4
=(4x^2+11x)-(6x^2+x-4)
=4x^2+11x-6x^2-x+4
=-2x^2+10x+4
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