$225x+12x-31x-8x+5x$
$-4d\:+16$
$\left(3x^3-2x^2y+5xy=y-3x\right)$
$1-2mnx=4$
$\frac{1-cosx}{sinx}=sinx$
$5x^2+x-21>0$
$15.4\cdot33.1$
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