$\left(\left(2x^2+3x-22\right)-\left(4x^2-5x+7\right)\right)+x-4$
$\frac{6x^2\cdot y-12xy^2}{x^2-4y^2}$
$y^3-xy^3$
$x^2-8x+20=5$
$9 = 3$
$ln\left(3x-6\right)+8^{2x-1}$
$13y^5-9y^5$
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