3n+9=n+30

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Solution for 3n+9=n+30 equation:


Simplifying
3n + 9 = n + 30

Reorder the terms:
9 + 3n = n + 30

Reorder the terms:
9 + 3n = 30 + n

Solving
9 + 3n = 30 + 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.
9 + 3n + -1n = 30 + n + -1n

Combine like terms: 3n + -1n = 2n
9 + 2n = 30 + n + -1n

Combine like terms: n + -1n = 0
9 + 2n = 30 + 0
9 + 2n = 30

Add '-9' to each side of the equation.
9 + -9 + 2n = 30 + -9

Combine like terms: 9 + -9 = 0
0 + 2n = 30 + -9
2n = 30 + -9

Combine like terms: 30 + -9 = 21
2n = 21

Divide each side by '2'.
n = 10.5

Simplifying
n = 10.5

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