$\frac{4x+6}{2};\:x=2$
$11ab+8ab+9ab+12ab$
$2n=128$
$\int3x^3e^xdx$
$4p-5=19$
$\lim_{n\to\infty}3+\frac{1}{n}$
$30f+20>28f+40$
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