$\frac{x^4+2x^3-x^2}{x^2}$
$\frac{3x^3-8x^2+6x+8}{x+4}$
$4\left(x+a\right)^2-49y^2$
$26\left(33-33\right)+42+60-\left(25-19\right)-61-\left(-17+24\right)$
$-18-\left(-27\right)$
$\lim_{x\to0}\frac{\ln\left(2x+1\right)}{lnx+3}$
$25-\:\left[\left(7-10\right)\cdot\left(-11-9\right)\:+5\left(-13\cdot12\right)\right]\:\cdot8$
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