$87=x+87$
$3975\cdot100$
$64\cdot64$
$451.92=200+0.94x$
$\frac{x+3}{3x-2}-\frac{x-3}{3x+2}=\frac{44}{9x^2-4}$
$x^3+5x^2-24x$
$\left(\frac{x^{-1}y^4}{x^4y^{-5}}\right)^2$
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