If f(a) = a - 5 and g(b)= 5 − b, what is the value of the expression ।f(x)।− ।g(x)। + ।f[g(x)]।?

1. ক।x - 5।
2. খ2x + 15✓
3. গ।- x।
4. ঘ।2x - 3।