21=4+9n

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Solution for 21=4+9n equation:


Simplifying
21 = 4 + 9n

Solving
21 = 4 + 9n

Solving for variable 'n'.

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

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

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

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

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

Combine like terms: 4 + -21 = -17
-9n = -17

Divide each side by '-9'.
n = 1.888888889

Simplifying
n = 1.888888889

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