-21-8n=-(3n-4)

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Solution for -21-8n=-(3n-4) equation:


Simplifying
-21 + -8n = -1(3n + -4)

Reorder the terms:
-21 + -8n = -1(-4 + 3n)
-21 + -8n = (-4 * -1 + 3n * -1)
-21 + -8n = (4 + -3n)

Solving
-21 + -8n = 4 + -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.
-21 + -8n + 3n = 4 + -3n + 3n

Combine like terms: -8n + 3n = -5n
-21 + -5n = 4 + -3n + 3n

Combine like terms: -3n + 3n = 0
-21 + -5n = 4 + 0
-21 + -5n = 4

Add '21' to each side of the equation.
-21 + 21 + -5n = 4 + 21

Combine like terms: -21 + 21 = 0
0 + -5n = 4 + 21
-5n = 4 + 21

Combine like terms: 4 + 21 = 25
-5n = 25

Divide each side by '-5'.
n = -5

Simplifying
n = -5

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