7. Task 6 № 11981: Find the value of the expression x - |-x| - x - 26 - 54 if x = -4

Substitute x = -4 into the expression: $$-4 - |-(-4)| - (-4) - 26 - 54$$ First, calculate the absolute value: $$|-(-4)| = |4| = 4$$ Substitute the absolute value back into the expression: $$-4 - 4 - (-4) - 26 - 54$$ Simplify: $$-4 - 4 + 4 - 26 - 54 = -4 - 26 - 54 = -30 - 54 = -84$$ So, the answer is **-84**.