$7x^2+6x$
$\int\frac{10x^3-20x^2+8}{x\left(x-2\right)}dx$
$28t^2+31t-5$
$64r^2+64rs+16s^2$
$16+24+32+40+48+56+64+72+80+88+96+104+112+120+128+136+144+152+160+168+176$
$\left(3x^2-9x\right)\left(x^2-9\right)$
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