$\left(2a^2-4a-7\right)\left(4a^3-2a+5\right)$
$-6+4q+\left(-6q\right)$
$-23\cdot4$
$y'+2xy^3=4y$
$5x^2-40x+20=0$
$6a^{3}b+\left(-3a^{3}b\right)$
$\left(-3\right)^2^2$
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