$\left(2x-2\right)\left(2x+5\right)$
$9a-b-2a-10b$
$-25\cdot30$
$5x^3y\left(3x^5y^5+2x^3y^2-11xy\right)$
$\frac{8x^2+4^4-5x}{2x^2}$
$-4:-12$
$\frac{\sqrt{a}-\sqrt{a}}{a-a}$
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