$-4x\ge-3+2x$
$-7+25x-9$
$\left(3x+2y+3x+2y\right)^2$
$\cos^2\left(21\right)-\cot^2\left(69\right)+1$
$\frac{x^2+6x+8\:}{x^2+5x+4}$
$-3a\:+\:1\:,\:a=2$
$\frac{5^7}{5^4}$
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