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$2x+7y=9$
$\left(\frac{110.25}{8.21}\right)$
$\left(-1+25x^4y^9z^2\right)^3$
$\frac{x-2}{3x+4}=\frac{1}{5}$
$\sqrt{cos^4t\cdot sin^2t\:+\:sin^4t\cdot cos^2t}$
$6x+6y+9z$
$158.900+129.200$
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