$\left(3x+4\right)\left(2x-1\right)$
$\left(-\:3\:+\:5\:-\:2\:\right)\:.\:\left(-\:8\:+\:3\:\right)\:-\:\left(-\:5\:\right)\:.\:\left(-\:3\:+\:7\:\right)$
$\left(3b-20a+14\right).\left(7ab+15a\right)$
$81x^2+36x+7$
$4\cdot2^3+2\cdot2^2-12$
$\left(-4\right)\left(3x-5\right)$
$3-4\cos\left(\theta\:+\frac{\pi}{2}\right)=2-3\cos\left(\theta\:+\frac{\pi}{2}\right)$
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