$9-\left(-5\right)-\left(-3-7-24\right)$
$2x+4y=28$
$\frac{\left(x-a\right)}{b}+\frac{\left(x-b\right)}{a}=2$
$\frac{4yx^{-1}\cdot\:-3x^{-2}y^2}{\left(-x^3y^0\right)^3}$
$\left(-5x+9\right)\left(-5x-9\right)$
$m5\cdot m-2$
$5x-1<6$
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