$\left(6x+a\right)\left(6x-b\right)$
$\left(6m\:7\:o\:5\:n\:11\:+17mn\:7\:o\right)\:$
$4+49$
$4x+4<9x+9$
$\left(5\right)\left(-3\right)+3\left(5\right)\left(-3\right)+6\left(5\right)\left(-3\right)$
$-\left(-19\right)\left(-12\right)$
$12342xy^{-89}$
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