Мне 3* х-7800=1200 (у+2958): 57=139 38007: (5000-z)=9

3 * х - 7800 = 1200
3х = 1200 + 7800
3х = 9000
х = 3000

(у + 2958) : 57 = 139
у + 2958 = 139 * 57
у + 2958 = 7923
у = 7923 - 2958
у = 4965

38007 : (5000 - z) = 9
5000 - z = 38007 : 9
5000 - z = 4223
z = 5000 - 4223
z = 777

3* х-7800=1200
7800+1200=9000
x=9000: 3
x=3000

(у+2958):57=139
139×57=7923
y=7923-2958
y=4965

38007:(5000-z)=9
38007: 9=4223
z=5000-4223
z=777