$5x+6=8x+39$
$c^2+2cd+d^2$
$5a\sqrt[3]{160x^7y^9z^{13}}$
$8b-2+3b$
$x^3+4x^2-5x+42$
$1,4x-2,8y=1$
$\lim_{x\to\infty}\left(\sqrt{x+4}-\sqrt{n+3}\right)$
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