$2x^2-13x-21$
$h\left(t\right)=\left(t-\frac{1}{t}\right)^{\frac{3}{2}}$
$\:\left[\:\left(-7\right)-\left(-12\right)+\left(-15\right)+\left(-3\right)\right]$
$25x^2+70x+4x$
$-30=-3y$
$5s-2s+6$
$5-\left(7+mn\right)+5mn$
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