Solve 30:(1-12+9)-(3*3-12:3)+21

$$30 : ( 1 - 12 + 9 ) - ( 3 \cdot 3 - 12 : 3 ) + 21$$

Evaluate

$$1$$

Solution Steps

Subtract 12 from 1 to get -11.

$$\frac{30}{-11+9}-\left(3\times 3-\frac{12}{3}\right)+21$$

Add -11 and 9 to get -2.

$$\frac{30}{-2}-\left(3\times 3-\frac{12}{3}\right)+21$$

Divide 30 by -2 to get -15.

$$-15-\left(3\times 3-\frac{12}{3}\right)+21$$

Multiply 3 and 3 to get 9.

$$-15-\left(9-\frac{12}{3}\right)+21$$

Divide 12 by 3 to get 4.

$$-15-\left(9-4\right)+21$$

Subtract 4 from 9 to get 5.

$$-15-5+21$$

Subtract 5 from -15 to get -20.

$$-20+21$$

Add -20 and 21 to get 1.

$$1$$

Factor

$$1$$