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75: (69-4z) = 15

37 * (105-3z) = 1998

(7z-41) * 28=2576

1) 69 - 4Z = 75 : 15

69 - 4Z = 5

4Z = 69 - 5

4Z = 64

Z = 64 : 4

Z = 16

...

2) 105 - 3Z = 1998 : 37

105 - 3Z = 54

3Z = 105 - 54

3Z = 51

Z = 51 : 3

Z = 17

...

3) 7Z - 41 = 2576 : 28

7Z - 41 = 92

7Z = 92 + 41

7Z = 133

Z = 133 : 7

Z = 19

75: (69-4z) = 15

69-4z=75/15

-4z=5-69

-4z=-64

4z=64

z=16

37 * (105-3z) = 1998

3885-111z=1998

-111z=-1887

z=17

(7z-41) * 28=2576

196z-1148=2576

196z=2576+1148

196z=3724

z=19