$2x^2+5x+12$
$\left(m+m^{-1}\right)=5$
$\left(5.^2y^3z\right).\left(2y^2z^2\right)$
$-7-\left(1-4\right)+\left(-4\right)^2$
$\left(xy\right)dx+\left(2x^2+4yx^2\right)dy=0$
$7a^2-15b^35b^3+9a^2-4b^3$
$-10\cdot11^{3x-10}=-84$
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