4n+15=2n+21

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Solution for 4n+15=2n+21 equation:


Simplifying
4n + 15 = 2n + 21

Reorder the terms:
15 + 4n = 2n + 21

Reorder the terms:
15 + 4n = 21 + 2n

Solving
15 + 4n = 21 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
15 + 4n + -2n = 21 + 2n + -2n

Combine like terms: 4n + -2n = 2n
15 + 2n = 21 + 2n + -2n

Combine like terms: 2n + -2n = 0
15 + 2n = 21 + 0
15 + 2n = 21

Add '-15' to each side of the equation.
15 + -15 + 2n = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2n = 21 + -15
2n = 21 + -15

Combine like terms: 21 + -15 = 6
2n = 6

Divide each side by '2'.
n = 3

Simplifying
n = 3

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