$2x-5y+2y-3x$
$\tan\left(x\right)+1=\sec\left(x\right)\left(\sin\left(x\right)+\cos\left(x\right)\right)$
$\left(1-\frac{3}{x}\right)^x$
$245x^4-45$
$30+11\left|-3\right|$
$-12p\:=\:-14p\:+\:18$
$4a^2-81b^4$
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