$j+j+j+j$
$6.5-7$
$3v+5-9$
$x^2-8x+4=0$
$\lim_{x\to7}\left(\frac{x-7}{3x^2-21}\right)$
$12+32-98+78+14-56-48$
$\frac{4}{x^2+5x+6}$
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