5n-(3n+12)=9

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Solution for 5n-(3n+12)=9 equation:


Simplifying
5n + -1(3n + 12) = 9

Reorder the terms:
5n + -1(12 + 3n) = 9
5n + (12 * -1 + 3n * -1) = 9
5n + (-12 + -3n) = 9

Reorder the terms:
-12 + 5n + -3n = 9

Combine like terms: 5n + -3n = 2n
-12 + 2n = 9

Solving
-12 + 2n = 9

Solving for variable 'n'.

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

Add '12' to each side of the equation.
-12 + 12 + 2n = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 2n = 9 + 12
2n = 9 + 12

Combine like terms: 9 + 12 = 21
2n = 21

Divide each side by '2'.
n = 10.5

Simplifying
n = 10.5

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