$0,0036x^2-0,04x-4$
$81a^4b^6-4c^4$
$t^2-t+25$
$2\left(5t-1\right)+7$
$9-\left(-7\right)-\left(-3\right)^4:\left(-3\right)^3$
$3\left(12x-2\right)\left(3x+3\right)$
$\lim_{x\to2}x$
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