$-4\:\:=\:_{2\:}$
$\left(8b+4d\right)\left(7b-6d\right)$
$25a^2+40ab+16b^2$
$6a+4b+5c+10a+3b-5c$
$\:-5x\:\ge\:15$
$x^2-8x+16=0$
$\left(-3\right)+\left(-9\right)\cdot\left(-2\right)+\left(-15\right)$
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