$\left(5\:+t\right)\left(25\:+t\right)$
$x^2-81=144$
$\frac{x^3-6}{x^4+6x^2+8}$
$\left(-12\right)+\left(+9\right)-\left(-11\right)-\left(-6\right)$
$5x+5x+3x+7x$
$3a^4\cdot5a^3$
$y^2-12y+32=0$
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