$-\left(+4\:-\:6\:-\:9\right)\:+\:\left(-4\:+\:5\:-\:2\right)$
$\left(x\right)\left(\sqrt{\frac{x}{y}}\right)-\left(y\right)\left(\frac{\left(\frac{x}{y}\right)^{\frac{3}{2}}}{3}\right)$
$5-2\left(4-x\right)\le3x-8\left(3-x\right)$
$x^2-121x=0$
$\left(2-6\right)+\left(15-8+4\right)$
$\int\cos\left(2x-\pi\right)dx$
$-x^2+3x+2$
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