Step-by-step explanation:
We have,
- 7x - 3(9 - 7x) ....... (1)
To find, the value of - 7x - 3(9 - 7x) = ?
Put x = - 1 in equation (1), we get
= - 7( - 1) - 3(9 - 7( - 1))
= 7 - 3(9 + 7)
= 7 - 3(16)
= 7 - 48
= - 41
Thus, the value of - 7x - 3(9 - 7x) = - 41
