$\left(2x-5\right)\left(3x+2\right)=6x^2-11x-10$
$\log x-\log5=\log7$
$163.885-31.15$
$2-2x\le8-5x$
$4x\:+-10x\:+\:2x$
$\left(3x-y+5z\right)^2$
$\left(2x+1\right)\cdot\left(2x-3\right)$
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