n+4+3n+5=21

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


Simplifying
n + 4 + 3n + 5 = 21

Reorder the terms:
4 + 5 + n + 3n = 21

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

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

Solving
9 + 4n = 21

Solving for variable 'n'.

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

Add '-9' to each side of the equation.
9 + -9 + 4n = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 4n = 21 + -9
4n = 21 + -9

Combine like terms: 21 + -9 = 12
4n = 12

Divide each side by '4'.
n = 3

Simplifying
n = 3

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