$9a^6-4b^4$
$25x^3-2x^2+5x^3-2$
$\log7=\log\left(x+7\right)-\log6$
$a^9-27$
$5\cdot4^2-3\cdot2^2+2$
$\int\frac{x^2-a^2}{x}dx$
$6x^2+24xy^2+16y^4$
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