$3b\:+\:2a\:5c\:-4\:6\:+\:8a\:7c\:-9$
$35y-14y^2+21y^3$
$\frac{1+i}{1+2i}$
$\left(-0.8\right)+-7.2-5.4$
$\frac{\left(9x^6-x^4+3x^2+2\right)}{\left(x-2\right)}$
$5y^2-2y-3=0$
$\left(\frac{e^3}{y^4}\right)^5$
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