Let $\alpha$ and $\beta$ be the two angles.
Then $\alpha + \beta = 180$ -- ( 1 )
Also $\alpha = 3 \beta - 212$
Substituting for $\alpha$ from above in ( 1 ), we get
$3\beta - 212 + \beta = 180$
$4\beta = 180 + 212 = 392$
Hence $\beta = \frac{392}{4} = 98^\circ$
Hence $\alpha = 180 - \beta = 180 - 98 = 82^\circ$