So to solve for x, you'll need to combine all the angles and equal it to 720, and from there we can solve.
[tex]120+100+120+x+10+120+x=720[/tex]
Combine like terms to get [tex]2x+470=720[/tex]
Subtract 470 on each side to get [tex]2x=250[/tex]
Then just divide on each side and you'll get [tex]x=125[/tex]
To find the value of the (x+10) angle, just substitute 125 for x and solve.
[tex]125+10=135[/tex]
