$25f^2-9$
$\left(2x^6\right)^4$
$\left(9cx^3-3\right)\left(9cx^3+9\right)$
$1+2+4$
$\left(-16\right)\left(-4\right)\left(-2\right)$
$x-2y=10\:\:$
$-150\cdot20$
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