Evaluate the expression: (-12 / -3) 4 - (-20) / (-6 6 / 3 + (-6))

Nambari ni: $-12 \div (-3) \times 4 - (-20)$
Kwanza, fanya mgawanyiko:

$$-12 \div (-3) = 4$$

Kisha, fanya kuzidisha:

$$4 \times 4 = 16$$

Mwisho, fanya kutoa:

$$16 - (-20) = 16 + 20 = 36$$

Hivyo, nambari ni 36.

Denominata ni: $-6 \times 6 \div 3 + (-6)$
Kwanza, fanya kuzidisha:

$$-6 \times 6 = -36$$

Kisha, fanya mgawanyiko:

$$-36 \div 3 = -12$$

Mwisho, fanya kujumlisha:

$$-12 + (-6) = -12 - 6 = -18$$

Hivyo, denominata ni $-18$.

$$\frac{36}{-18} = -2$$

Thamani ya usemi ni: $-2$