$3\cdot3^2+5\cdot\left(-1\right)-1$
$\left(-8\right)-\left(-13\right)$
$6x-4>9x+15$
$4\cdot9cm^2$
$\int\frac{4x+1}{\left(2x^2+x\right)^4}dx$
$3^{2x}-4\left(3\right)^x+1=0$
$43-\left(-14\right)$
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