$\frac{4x^2-9^1}{x-3}$
$a-b-c+a+3b-4c+2a-3b+6-5a-4b-3c-10$
$\left(5xy^2\right)\left(3x^2y\right)\left(-7x^5\right)$
$4x^2-4x+2$
$\frac{32x^2}{16x^9}$
$\left(8m\:+\:4n\:-\:6p\:-\:9q\right)^2$
$\int\:4\:sen\:7x\:dx$
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