$\left(3x^7+2\right)\cdot\left(5x^2+2x^3-2\right)$
$\frac{x^2-25}{x^2-9x+20}$
$-7\left(1+2r\right)+7\left(6r+3\right)$
$\left(x^3+5x^2+x\right)^3$
$4^{x+2}+2^{2\left(x+1\right)}$
$6\left(9\cdot4\right)+7+\left(3+2\right)$
$-3\:\cdot\:-73$
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