$\frac{3^{\infty}}{7^{\infty}}$
$42mxb\left(48m^3\right)$
$2x^2-3x-7$
$y^2+4y-2^2$
$4\left(-7+9q\right)$
$3^x\:+\:3^x\:-\:3\:\cdot3^x\:+9^x\:+\:3\:\cdot\:9^x$
$\left(\frac{2}{t}-\frac{t^2}{4}\right)^4$
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