$\left(x\:+\:4\right)\:\left(x\:-\:2y\:+\:1\right)$
$f\left(x\right)=x^2-2x-8$
$y'\:+2ty=3t$
$\left(2x-5x\right)\left(2x+5y\right)$
$7x\left(-8\right)+-7x$
$2a^2+3ab+4a^2+10ab-b$
$8^2+\left|-1\right|$
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