7 36/99 - 5 11/99 - 8 90/99 - 4 22/99

Compute step by step:

• 7 36/99 = 7 4/11 = 81/11
• 5 11/99 = 5 1/9 = 46/9
• 8 90/99 = 8 10/11 = 98/11
• 4 22/99 = 4 2/9 = 38/9

Then 81/11 − 46/9 − 98/11 − 38/9 = (81−98)/11 + (−46−38)/9 = −17/11 − 84/9 = −17/11 − 28/3

Common denominator 33: = −51/33 − 308/33 = −359/33

Final result: -359/33 ≈ -10.8788.