$\frac{a^2}{ab}$
$\left(-167\right)-\left(-268\right)$
$e^{\ln\left(9\right)}-e^{\ln\left(3\right)}$
$\frac{4x^5+2x^3-8y^3}{x^5}$
$3x+1\le7$
$-y=5x^2$
$12.1\cdot3.8$
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