3+7n=21+n

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Solution for 3+7n=21+n equation:


Simplifying
3 + 7n = 21 + n

Solving
3 + 7n = 21 + 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.
3 + 7n + -1n = 21 + n + -1n

Combine like terms: 7n + -1n = 6n
3 + 6n = 21 + n + -1n

Combine like terms: n + -1n = 0
3 + 6n = 21 + 0
3 + 6n = 21

Add '-3' to each side of the equation.
3 + -3 + 6n = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 6n = 21 + -3
6n = 21 + -3

Combine like terms: 21 + -3 = 18
6n = 18

Divide each side by '6'.
n = 3

Simplifying
n = 3

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