3n=-4n+21

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


Simplifying
3n = -4n + 21

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

Solving
3n = 21 + -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.
3n + 4n = 21 + -4n + 4n

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

Combine like terms: -4n + 4n = 0
7n = 21 + 0
7n = 21

Divide each side by '7'.
n = 3

Simplifying
n = 3

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