$9\:+\:2\left(-1\right)$
$2\left(b+8\right)-6\left(1-3b\right)$
$16\cdot26$
$-2\left(x+3y-4z\right)+6\left(3z-2\right)$
$2\sin2x+\cos x=0$
$\left(x-1\right)^2-\left(x-1\right)^2+12\ge0$
$m^2+3m-13$
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