$\left(2^6\right)^7$
$9\cdot x-y^2+12\cdot x-y\cdot x+y+4\cdot x+y^2$
$\left(-123\right)-\left(-123\right)$
$x^3-2x^2-3x$
$2x+15<0$
$\int\frac{5x-2}{x^2-2x}\:dx$
$\left(4x-1\right)\left(x+3\right)$
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