15=1+3n+8

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Solution for 15=1+3n+8 equation:


Simplifying
15 = 1 + 3n + 8

Reorder the terms:
15 = 1 + 8 + 3n

Combine like terms: 1 + 8 = 9
15 = 9 + 3n

Solving
15 = 9 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
15 + -3n = 9 + 3n + -3n

Combine like terms: 3n + -3n = 0
15 + -3n = 9 + 0
15 + -3n = 9

Add '-15' to each side of the equation.
15 + -15 + -3n = 9 + -15

Combine like terms: 15 + -15 = 0
0 + -3n = 9 + -15
-3n = 9 + -15

Combine like terms: 9 + -15 = -6
-3n = -6

Divide each side by '-3'.
n = 2

Simplifying
n = 2

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