4n+21-7n=6

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Solution for 4n+21-7n=6 equation:


Simplifying
4n + 21 + -7n = 6

Reorder the terms:
21 + 4n + -7n = 6

Combine like terms: 4n + -7n = -3n
21 + -3n = 6

Solving
21 + -3n = 6

Solving for variable 'n'.

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

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

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

Combine like terms: 6 + -21 = -15
-3n = -15

Divide each side by '-3'.
n = 5

Simplifying
n = 5

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