$2.83-3$
$5cos\theta\:-4=-9;\:0^{\circ\:}\le\:\theta\:\le\:180^{\circ\:}$
$\sqrt{1-11x}=32$
$\left(35^3\right)^7$
$48-28x+3x^2$
$2x-3\geq6x-7$
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