$\:-9x+1=\:-80\:\:$
$-12\:.\:-6\::\:2$
$x^2-15x\:+8\:=0$
$y'+y=\frac{1}{\left(1+e^{2x}\right)}$
$\left(12-14+6\right)\cdot\left(-7\right)+2$
$-7xy^5-12xy^2+3x^2y^2$
$m^2+2mb+b^2$
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