Question

ABC whose angle A =2x+4
and angle B = 5x+6

Answer 1

Sum of all angles =180 therefore
2x + 4 +5x+6+x (let it be x ) =180 ans will be 85/4

Answer 2

Here is your answer buddy....
A=2x+4,B=5x+6, let C = c, Sum is 180 by the property of triangle.
2x+4+5x+6+c=180
7x+10+c=180
7x+c=180-10
7x+c=170
c=170/7x..