7n+21=30+4n

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Solution for 7n+21=30+4n equation:


Simplifying
7n + 21 = 30 + 4n

Reorder the terms:
21 + 7n = 30 + 4n

Solving
21 + 7n = 30 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
21 + 7n + -4n = 30 + 4n + -4n

Combine like terms: 7n + -4n = 3n
21 + 3n = 30 + 4n + -4n

Combine like terms: 4n + -4n = 0
21 + 3n = 30 + 0
21 + 3n = 30

Add '-21' to each side of the equation.
21 + -21 + 3n = 30 + -21

Combine like terms: 21 + -21 = 0
0 + 3n = 30 + -21
3n = 30 + -21

Combine like terms: 30 + -21 = 9
3n = 9

Divide each side by '3'.
n = 3

Simplifying
n = 3

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