$7+2k+5k-3$
$1431=15.25x+150$
$-1+6+3+4-9$
$\left(2x+6\right)\cdot\left(6x^2+10x+2\right)$
$a^3+2a^2+3a$
$x^2-x-156=0$
$\int\frac{x-1}{x^2+5x+6}dx$
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