$9t^2-4t^2$
$\frac{2\cdot107}{63\times10^{-27}\cdot123\times10^{-9}}$
$2\left(\infty^2\right)+4\left(\infty\right)-6$
$39a^2-18a^2$
$y^2-16y+64$
$9x^3\:-\:6x^2\:+\:3x\:-\:3$
$49m^2-4n^8$
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