N-21=(-N)+(-N)

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Solution for N-21=(-N)+(-N) equation:


Simplifying
N + -21 = (-1N) + (-1N)

Reorder the terms:
-21 + N = (-1N) + (-1N)

Combine like terms: (-1N) + (-1N) = -2N
-21 + N = -2N

Solving
-21 + N = -2N

Solving for variable 'N'.

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

Add '2N' to each side of the equation.
-21 + N + 2N = -2N + 2N

Combine like terms: N + 2N = 3N
-21 + 3N = -2N + 2N

Combine like terms: -2N + 2N = 0
-21 + 3N = 0

Add '21' to each side of the equation.
-21 + 21 + 3N = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 3N = 0 + 21
3N = 0 + 21

Combine like terms: 0 + 21 = 21
3N = 21

Divide each side by '3'.
N = 7

Simplifying
N = 7

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