$x^2+13x-14$
$8-24:\left(-1-5\right)+\left(-20:4+7\right).\left(-7\right)=\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\frac{5}{2}x+\frac{1}{2}\left(\frac{1}{5}x-\frac{3}{4}\right)\leq\frac{3}{8}-\frac{3}{2}\left(\frac{1}{3}-x\right)$
$7a-8c+4b+6c-4b+3a$
$4-30-2-2+5$
$72y+43y+24x+32y+21x+12x$
$x\cdot2x+4$
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