$\left(x+2\right)\left(x+1\right)\ge0$
$-\left(9-4+5\right)-\left(-3+11\right)$
$\frac{dy}{\frac{dx}{1+3y}}=\frac{x}{x^2+4}$
$2a+7b+5a+6b$
$-\frac{4}{5}x^2+0.4x^3+0.3x^2-\frac{7}{8}x^3+8x-4$
$3\left(5a+9\right)-4a$
$\left(\frac{1}{3}a-2b\right)\left(6a-9b+3\right)$
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