Ответы на вопрос:
1) (5020+x): 25=360
5020+х = 360*25
5020+х = 9000
х = 9000 - 5020
х = 3980;
2) 820: x*4-16=32
820: x*4 = 32 +16
820: x*4 = 48
820: x = 48 : 4
820: x = 12
х = 820 : 12
х = 68
3) 1000-x: 36=388
x: 36 = 1000 - 388
x: 36 = 612
х = 612 * 36
х = 22032
4) (5080-x: 5)*3=13935
5080-x: 5 = 13935 : 3
5080-x: 5 = 4645
х : 5 = 5080 - 4645
х : 5 = 435
х = 435*5
х = 2175
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