-12=n+3n

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Solution for -12=n+3n equation:


Simplifying
-12 = n + 3n

Combine like terms: n + 3n = 4n
-12 = 4n

Solving
-12 = 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
-12 + -4n = 4n + -4n

Combine like terms: 4n + -4n = 0
-12 + -4n = 0

Add '12' to each side of the equation.
-12 + 12 + -4n = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -4n = 0 + 12
-4n = 0 + 12

Combine like terms: 0 + 12 = 12
-4n = 12

Divide each side by '-4'.
n = -3

Simplifying
n = -3

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