$\left(2x+5\right)\left(2x+1\right)$
$xy=4y$
$6a^2b^4c+12bc+18ab^2c$
$x^2-8x-4=0$
$3^2-0$
$\frac{2^1}{1}x^1$
$4xy-6yx+3xy$
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