Find the value of x from the following figure.

From the given figure, $\angle \mathrm{A}=\mathrm{x},\angle \mathrm{B}=90°,\angle \mathrm{C}=60°,\angle \mathrm{D}=70°$

In a quadrilateral, 

According to the angle sum property of a quadrilateral, $\angle \mathrm{A}+\angle \mathrm{B}+\angle \mathrm{C}+\angle \mathrm{D}=360°$ 

So, $\mathrm{x}+90°+60°+70°=360°$ 

$\Rightarrow \mathrm{x}+220°=360°$

$\Rightarrow \mathrm{x}=360°-220°=140°$

Therefore, the value of $\mathrm{x}=140°$