What is -20-(-21)-(-20)+7 ?

The solution to -20-(-21)-(-20)+7 is 28

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-20-(-21)-(-20)+7

- 20 - (- 21) - (- 20) + 7

28

Solution steps

- 20 - (- 21) - (- 20) + 7

Follow the PEMDAS order of operations

Add and subtract (left to right)

Apply rule

- (- a) = + a

- (- 21) = + 21

= - 20 + 21 - (- 20) + 7

- 20 + 21 = 1

= 1 - (- 20) + 7

Apply rule

- (- a) = + a

- (- 20) = + 20

= 1 + 20 + 7

1 + 20 = 21

= 21 + 7

21 + 7 = 28

= 28

1 - (2 \div 15)

18 - 7 + 12 + 25 - 8 - 14

12 \times 4^{4}

\frac{12}{20} \times \frac{15}{25}

(10 + 1 + 5) \div 8 + (80 + 40) \div 60