15=4-(n+7)

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Solution for 15=4-(n+7) equation:


Simplifying
15 = 4 + -1(n + 7)

Reorder the terms:
15 = 4 + -1(7 + n)
15 = 4 + (7 * -1 + n * -1)
15 = 4 + (-7 + -1n)

Combine like terms: 4 + -7 = -3
15 = -3 + -1n

Solving
15 = -3 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
15 + n = -3 + -1n + n

Combine like terms: -1n + n = 0
15 + n = -3 + 0
15 + n = -3

Add '-15' to each side of the equation.
15 + -15 + n = -3 + -15

Combine like terms: 15 + -15 = 0
0 + n = -3 + -15
n = -3 + -15

Combine like terms: -3 + -15 = -18
n = -18

Simplifying
n = -18

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