1)43*x+73=502
43*x=502-73
43*x=429
x=429/43=9 42/43
2)67-29*y=25
29*y=67-25
29*y=42
y=42/29=1 13/29
3)19*y-200=47
19*y=47+200
19*y=247
y=247/19
y=13
4)83+29*x=982
29*x=982-83
29*x=899
x=899/29
x=31
<span>12 7/12- 4 5/12 - (20 3/4- 19 3/4) = 8 2/12 - 1=7 2/12=7 1/6</span>