$\left(-25\right).\left(-5\right)$
$7x-3+2x+1$
$\:9x\:-\:3y\:+\:\left(-10x\right)\:+\:\left(-8y\right)$
$4x^2-12x+98$
$\left(x+a\right)\left(x-2\right)=x^2+bx+6$
$5x-1\ge-2$
$\tan^{-1}\left(\frac{800}{700}\right)$
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