$8:-4+5-3+3\cdot2$
$\frac{x}{4x^2+2x}$
$13+15\cdot200$
$7x+1\ge3x-27$
$\frac{2}{3}p+\frac{1}{5}-1+\frac{5}{6}p$
$21+9b-4b$
$\frac{\left(sin^2x+cos^2x\right)}{1-\left(\:\frac{cos^2x}{sin^2x}\right)}$
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