$.\:\left(\:x\:+\:3\right)\left(x\:+\:7\right)$
$x^{-4}y$
$\frac{12x^7+24x+3}{3x}$
$\left(x^3+x\right)\left(x-4\right)$
$x^2-0.09$
$-7y+6x-3y-9x$
$\left(4.7\right)^2$
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