What is 17-(-4-20)+(8-(-16))-9 ?

The solution to 17-(-4-20)+(8-(-16))-9 is 56

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17-(-4-20)+(8-(-16))-9

17 - (- 4 - 20) + (8 - (- 16)) - 9

56

Solution steps

17 - (- 4 - 20) + (8 - (- 16)) - 9

Follow the PEMDAS order of operations

Calculate within parentheses

(- 4 - 20) : - 24

- 4 - 20

- 4 - 20 = - 24

= - 24

= 17 - (- 24) + (8 - (- 16)) - 9

Calculate within parentheses

(8 - (- 16)) : 24

8 - (- 16)

Add and subtract (left to right)

Apply rule

- (- a) = + a

- (- 16) = + 16

= 8 + 16

8 + 16 = 24

= 24

= 17 - (- 24) + 24 - 9

Add and subtract (left to right)

17 - (- 24) + 24 - 9 : 56

17 - (- 24) + 24 - 9

Apply rule

- (- a) = + a

- (- 24) = + 24

= 17 + 24 + 24 - 9

17 + 24 = 41

= 41 + 24 - 9

41 + 24 = 65

= 65 - 9

65 - 9 = 56

= 56

= 56

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