12+18-9=n

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Solution for 12+18-9=n equation:


Simplifying
12 + 18 + -9 = n

Combine like terms: 12 + 18 = 30
30 + -9 = n

Combine like terms: 30 + -9 = 21
21 = n

Solving
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.
21 + -1n = n + -1n

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

Add '-21' to each side of the equation.
21 + -21 + -1n = 0 + -21

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

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

Divide each side by '-1'.
n = 21

Simplifying
n = 21

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