$36x^{16}-84x^8+49$
$\frac{5}{8}x-\frac{1}{5}x=17$
$4\left(2\:+\:5n\right)$
$x^2+14x+49=0$
$\left(1+sin\:x\right)\left(cos\:x-cot\:x\right)$
$a^4-b^2n^6$
$15x^2+28x+5$
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