$\left(5+ab\right)\left(5-ab\right)$
$x^{2+9}$
$2^5+5-15+4+\left(-18\right)-8+56-4-21$
$\left(-x+y\right)-\left\{4x+2y+\left[-x-y-\left(x+y\right)\right]\right\}$
$5^2\cdot5^{10}\cdot5^8\cdot5^0\cdot5^{-10}\cdot5$
$\frac{5}{2}a^b\:x\:\frac{5}{3}a^5$
$\int\left(x^3.e^{2x}\right)dx$
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