4n+5n-15=12

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Solution for 4n+5n-15=12 equation:


Simplifying
4n + 5n + -15 = 12

Reorder the terms:
-15 + 4n + 5n = 12

Combine like terms: 4n + 5n = 9n
-15 + 9n = 12

Solving
-15 + 9n = 12

Solving for variable 'n'.

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

Add '15' to each side of the equation.
-15 + 15 + 9n = 12 + 15

Combine like terms: -15 + 15 = 0
0 + 9n = 12 + 15
9n = 12 + 15

Combine like terms: 12 + 15 = 27
9n = 27

Divide each side by '9'.
n = 3

Simplifying
n = 3

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