$8xy+3x-yx+7x-3y$
$x^4+4x^3+5x^2-6x-4$
$\frac{\left(6x^3+8x^2-15x-20\right)}{16x^2-64}$
$9^x+3a+9a+11a$
$3x^2-2x+8$
$3x^3+4x^2-59x-20$
$-6x^2+16x+16$
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