Answer:
X=12
A=36
C= 86
Step-by-step explanation:
to find x:
7x+2+3x=122
solve for x
x=12
to find a:
the 3x is a corresponding angle to A, so A is 3 times 12 which is 36
to find C:
7x+2, same thing as before, substitute the x
7(12)+2
86
To check, add up all, should be 180
58+36+86=180
:)
