$25x^2-25x+40$
$f\left(x\right)=\frac{4}{x^3+4x}$
$\frac{6xy+3x^2y}{x^2-4}\cdot\frac{x^2-3x+2}{12xy}$
$5\left(3x-4\right)-\left(x^2-2\right)-2x\left(x-3\right)$
$59.89-73.91-51.43+5.67+27.39+89.86$
$+8+6-4+2-8-6-10$
$-7\left(x-2\right)+5\left(3-x\right)-4x$
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