21=-4+8(n+7)

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Solution for 21=-4+8(n+7) equation:


Simplifying
21 = -4 + 8(n + 7)

Reorder the terms:
21 = -4 + 8(7 + n)
21 = -4 + (7 * 8 + n * 8)
21 = -4 + (56 + 8n)

Combine like terms: -4 + 56 = 52
21 = 52 + 8n

Solving
21 = 52 + 8n

Solving for variable 'n'.

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

Add '-8n' to each side of the equation.
21 + -8n = 52 + 8n + -8n

Combine like terms: 8n + -8n = 0
21 + -8n = 52 + 0
21 + -8n = 52

Add '-21' to each side of the equation.
21 + -21 + -8n = 52 + -21

Combine like terms: 21 + -21 = 0
0 + -8n = 52 + -21
-8n = 52 + -21

Combine like terms: 52 + -21 = 31
-8n = 31

Divide each side by '-8'.
n = -3.875

Simplifying
n = -3.875

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