2n+21=4n+15

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


Simplifying
2n + 21 = 4n + 15

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

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

Solving
21 + 2n = 15 + 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.
21 + 2n + -4n = 15 + 4n + -4n

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

Combine like terms: 4n + -4n = 0
21 + -2n = 15 + 0
21 + -2n = 15

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

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

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

Divide each side by '-2'.
n = 3

Simplifying
n = 3

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