What is [(-3-9)-(-5)]-(4-15) ?

The solution to [(-3-9)-(-5)]-(4-15) is 4

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[(-3-9)-(-5)]-(4-15)

[(- 3 - 9) - (- 5)] - (4 - 15)

4

Solution steps

[(- 3 - 9) - (- 5)] - (4 - 15)

Follow the PEMDAS order of operations

Calculate within parentheses

[(- 3 - 9) - (- 5)] : - 7

= - 7 - (4 - 15)

Calculate within parentheses

(4 - 15) : - 11

= - 7 - (- 11)

Add and subtract (left to right)

- 7 - (- 11) : 4

= 4

- 11 - 8 + 21

- 2 (- 1) + 7

2 \cdot 15 - 4 \cdot 13

2^{2} {40 - 2 [10 - 2 (8 - 6)]}

3 - 4 (- 1)