1) (3728-х) : 54 = 69 2) (148+х) * 3 = 1584 3) 992: (130-х) = 62 4) (715-х) * 83 = 8383 5) 2244: (111 х-9 х) = 22 6) 999 + (602 х-582 х) = 2199 7) 1000 - (501 х+19 х) = 480

1) 3728/54-х/54-69=0

69,037-х/54-69=0

0,037-х/54=0

х = (- (-0,037)) * 54=0,037*54=1,99

2) 444+х*3-1584=0

-1140+х*3=0

х=1140/3=380

3) 992/130-х=0

4) 59345-х*83-8383=0

50962-х=0

х=-50962/83=50962/83=614

5) 2244/192 х-22=0

22/х-22=0

6) 999+20 х-2199=0

-1200+20 х=0

х=1200/20=60

7) 1000-520 х-480=0

520-520 х=0

х=-520/520=520/520=1