$\left(3-8y\right)\cdot\left(-2.5\right)\:$
$64b^4-4b^2$
$\left(2st-3\right)\left(5s+3t+4\right)$
$23.70-4.13$
$2x+5<3x\:-x+8$
$7x^2-8x+11$
$m-2m+2n$
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