$2s+2s$
$-2x+8=18$
$-14\left(-\frac{3}{7n\:+6}\right)$
$\cos\left(8x\right)\cdot\cos\left(5x\right)$
$x^2-13x+22$
$\frac{s}{\left(s^2+4\right)\left(s^2+16\right)}$
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