Jawab pake cara ya kak

64.2x+8+x+13=90
3x+21=90
3x=90-21
3x=69
x=69/3
x=23
67.x=180-83=97
y=180-(180-115)=115
z=75
x+y-z=97+115-75=212-75=137-(z-y-x=75-115-97)=