7=n-(-21)

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Solution for 7=n-(-21) equation:


Simplifying
7 = n + -1(-21)

Multiply -1 * -21
7 = n + 21

Reorder the terms:
7 = 21 + n

Solving
7 = 21 + n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
7 + -1n = 21 + n + -1n

Combine like terms: n + -1n = 0
7 + -1n = 21 + 0
7 + -1n = 21

Add '-7' to each side of the equation.
7 + -7 + -1n = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -1n = 21 + -7
-1n = 21 + -7

Combine like terms: 21 + -7 = 14
-1n = 14

Divide each side by '-1'.
n = -14

Simplifying
n = -14

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