Question

21 + (n-1) (-3) = - 81​

Answer 1

21 + (n-1) (-3) = - 81

or, 21-3(n-1)=-81

or, 21-3n+3=-81

or, -3n =-81-21-3

or, -3n = -102-3

or, -3n = -105

or, n=105/3

so, n = 35

Answer 2

Answer:

n=19$\frac{-2}{3}$

Step-by-step explanation:

21 + (n-1) (-3) = - 81​

21+[-3(n-1)]= - 81

21+[-3n+1]=-81

21+1-3n=81

-3n=81-22

-3n=59

n=59/-3

n=19$\frac{-2}{3}$