$6y=180-x$
$2x^2-8x-8$
$-a-5^a$
$\lim_{x\to1}\:\:2x^2-3x+4$
$5 x ^ { 3 } + 7 x ^ { 4 } + 6 x ^ { 3 } - 5 x + 4$
$1+\frac{1}{sec^2x}=1$
$\lim_{x\to0}\left(\frac{x^8-1}{x^3-1}\right)$
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