$-2.351-4.87$
$9m^2n^2+42mn+4n$
$3x+7+x+1$
$99\cdot99$
$\left(8x+5\right)\left(8x-2\right)$
$\int\:\:\:t\sqrt{t^2+2}dt$
$\left(-8y-9x\right)^2$
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