3+4n+5n=21

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Solution for 3+4n+5n=21 equation: 


Simplifying
3 + 4n + 5n = 21

Combine like terms: 4n + 5n = 9n
3 + 9n = 21

Solving
3 + 9n = 21

Solving for variable 'n'.

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

Add '-3' to each side of the equation.
3 + -3 + 9n = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 9n = 21 + -3
9n = 21 + -3

Combine like terms: 21 + -3 = 18
9n = 18

Divide each side by '9'.
n = 2

Simplifying
n = 2

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