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

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Solution for -81=21+(n-1)(-3) equation:


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

Reorder the terms:
-81 = 21 + (-1 + n)(-3)

Reorder the terms for easier multiplication:
-81 = 21 + -3(-1 + n)
-81 = 21 + (-1 * -3 + n * -3)
-81 = 21 + (3 + -3n)

Combine like terms: 21 + 3 = 24
-81 = 24 + -3n

Solving
-81 = 24 + -3n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '3n' to each side of the equation.
-81 + 3n = 24 + -3n + 3n

Combine like terms: -3n + 3n = 0
-81 + 3n = 24 + 0
-81 + 3n = 24

Add '81' to each side of the equation.
-81 + 81 + 3n = 24 + 81

Combine like terms: -81 + 81 = 0
0 + 3n = 24 + 81
3n = 24 + 81

Combine like terms: 24 + 81 = 105
3n = 105

Divide each side by '3'.
n = 35

Simplifying
n = 35

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