3n+7=9n+21

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Solution for 3n+7=9n+21 equation:


Simplifying
3n + 7 = 9n + 21

Reorder the terms:
7 + 3n = 9n + 21

Reorder the terms:
7 + 3n = 21 + 9n

Solving
7 + 3n = 21 + 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.
7 + 3n + -9n = 21 + 9n + -9n

Combine like terms: 3n + -9n = -6n
7 + -6n = 21 + 9n + -9n

Combine like terms: 9n + -9n = 0
7 + -6n = 21 + 0
7 + -6n = 21

Add '-7' to each side of the equation.
7 + -7 + -6n = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -6n = 21 + -7
-6n = 21 + -7

Combine like terms: 21 + -7 = 14
-6n = 14

Divide each side by '-6'.
n = -2.333333333

Simplifying
n = -2.333333333

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