Answer:
x = 64.5
Explanation:
Consecutive angles of a parallelogram are supplementary, that is, they sum up to 180 degrees
[tex]\begin{gathered} (3x-98)+(x+20)=180 \\ \\ 3x+x-98+20=180 \\ \\ 4x-78=180 \\ \\ 4x=180+78 \\ \\ 4x=258 \\ \\ x=\frac{258}{4}=64.5 \end{gathered}[/tex]
