$x^2+4x-5x+3x$
$7x^4-5x^4$
$22-\left(-2\right)^2$
$13x^4y^6-5x^2y^3$
$9x^44+6x^2\:\:-3x$
$\lim_{x\to0}\left(1+7x\right)^{\frac{7}{x}}$
$x^2-4-x^2-4$
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