$x\left(x^2+x-1\right)-x^2$
$2^{-7}\cdot2^{15}$
$9a^2+12ab+15a^3+24ab^3$
$x+y+5x-y+5x+y$
$\left(5m^2+8n^2\right)^2$
$-16.75+23.59$
$\int\frac{2x^2-5x+4}{\left(x-3\right)\left(x+3\right)}dx$
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