REGULAR 7TH GRADE MATH Slove each problem for x, showing all work

Answer: x=27
Step-by-step explanation:
The degrees of any triangle are equal to 180
83+43= 126 so 126 degrees out of 180 are accounted for
180-126=54 this is what is left over to equal 2x
54/2=27 divide 54 in half, to get 27, (27x2=54)