$-y^2y^2-5xy^3-4y^4+7xy^3-8+x^2y^2$
$\lim_{x\to0}\:\frac{senx}{tan^3x}$
$4q-10r$
$15\:-\:\left(-20\right)$
$-3m^3-7m^3$
$9-\left(-7\right)-\left(-3\right)^4:\left(-3\right)^3$
$log7\left(4x^2-6\right)-log7\left(3x+4\right)=0$
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