$-\left(3x+6\right)\left(3x+4\right)$
$\left(-4\right)^2\:\left(-4\right)^2$
$98.765+146.38+2.675+36.4186+2.3+158.16$
$\:y^{-4}z^5\:$
$=x^{2}-y^{2}+6x-6y$
$\log_{10}x=-2$
$2x^2+9x=x-14$
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