$\left(-5a\:+\:b\:+\:10\:\right)\:-\left(\:7a\:+\:b\:+\:18\right)\:$
$-2x+5>3-x$
$5.45-10.22-15.44+16$
$x+9=13$
$729x^3y^3-216z^9f^6$
$\frac{10x^3x^2-x+1}{5x-x^3-3x^4}$
$y-mx=b$
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