15=4.3n+2.1(n+4)

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Solution for 15=4.3n+2.1(n+4) equation: 


Simplifying
15 = 4.3n + 2.1(n + 4)

Reorder the terms:
15 = 4.3n + 2.1(4 + n)
15 = 4.3n + (4 * 2.1 + n * 2.1)
15 = 4.3n + (8.4 + 2.1n)

Reorder the terms:
15 = 8.4 + 4.3n + 2.1n

Combine like terms: 4.3n + 2.1n = 6.4n
15 = 8.4 + 6.4n

Solving
15 = 8.4 + 6.4n

Solving for variable 'n'.

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

Add '-6.4n' to each side of the equation.
15 + -6.4n = 8.4 + 6.4n + -6.4n

Combine like terms: 6.4n + -6.4n = 0.0
15 + -6.4n = 8.4 + 0.0
15 + -6.4n = 8.4

Add '-15' to each side of the equation.
15 + -15 + -6.4n = 8.4 + -15

Combine like terms: 15 + -15 = 0
0 + -6.4n = 8.4 + -15
-6.4n = 8.4 + -15

Combine like terms: 8.4 + -15 = -6.6
-6.4n = -6.6

Divide each side by '-6.4'.
n = 1.03125

Simplifying
n = 1.03125

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