$7^7\cdot7^{-5}$
$2^{-9^{2^{-1}}}$
$\left(2^x-2^{-x}\right)^2+2$
$-\left(3\right)^2\cdot\left(-3\right)^3\cdot\left(3\right)^1$
$3x+9x^2+x+3$
$14x^2+3x-5$
$\int x^2\left(3-2x\right)dx$
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