-4+2n+-8=8n+1+-4n+-21

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Solution for -4+2n+-8=8n+1+-4n+-21 equation: 


Simplifying
-4 + 2n + -8 = 8n + 1 + -4n + -21

Reorder the terms:
-4 + -8 + 2n = 8n + 1 + -4n + -21

Combine like terms: -4 + -8 = -12
-12 + 2n = 8n + 1 + -4n + -21

Reorder the terms:
-12 + 2n = 1 + -21 + 8n + -4n

Combine like terms: 1 + -21 = -20
-12 + 2n = -20 + 8n + -4n

Combine like terms: 8n + -4n = 4n
-12 + 2n = -20 + 4n

Solving
-12 + 2n = -20 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
-12 + 2n + -4n = -20 + 4n + -4n

Combine like terms: 2n + -4n = -2n
-12 + -2n = -20 + 4n + -4n

Combine like terms: 4n + -4n = 0
-12 + -2n = -20 + 0
-12 + -2n = -20

Add '12' to each side of the equation.
-12 + 12 + -2n = -20 + 12

Combine like terms: -12 + 12 = 0
0 + -2n = -20 + 12
-2n = -20 + 12

Combine like terms: -20 + 12 = -8
-2n = -8

Divide each side by '-2'.
n = 4

Simplifying
n = 4

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