$-b^2-b$
$21-\left(-9\right)$
$\frac{1}{x}+x^{2}y^{2}=0$
$x^2+x=x$
$-7m^2-9m^2$
$tanx\:+sec\:x\:-1$
$\left(4x+3\right)+x+9$
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