-21-n=3(-5n+7)

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Solution for -21-n=3(-5n+7) equation:


Simplifying
-21 + -1n = 3(-5n + 7)

Reorder the terms:
-21 + -1n = 3(7 + -5n)
-21 + -1n = (7 * 3 + -5n * 3)
-21 + -1n = (21 + -15n)

Solving
-21 + -1n = 21 + -15n

Solving for variable 'n'.

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

Add '15n' to each side of the equation.
-21 + -1n + 15n = 21 + -15n + 15n

Combine like terms: -1n + 15n = 14n
-21 + 14n = 21 + -15n + 15n

Combine like terms: -15n + 15n = 0
-21 + 14n = 21 + 0
-21 + 14n = 21

Add '21' to each side of the equation.
-21 + 21 + 14n = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 14n = 21 + 21
14n = 21 + 21

Combine like terms: 21 + 21 = 42
14n = 42

Divide each side by '14'.
n = 3

Simplifying
n = 3

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