15=4.3-2.1(n-4)

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


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

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

Combine like terms: 4.3 + 8.4 = 12.7
15 = 12.7 + -2.1n

Solving
15 = 12.7 + -2.1n

Solving for variable 'n'.

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

Add '2.1n' to each side of the equation.
15 + 2.1n = 12.7 + -2.1n + 2.1n

Combine like terms: -2.1n + 2.1n = 0.0
15 + 2.1n = 12.7 + 0.0
15 + 2.1n = 12.7

Add '-15' to each side of the equation.
15 + -15 + 2.1n = 12.7 + -15

Combine like terms: 15 + -15 = 0
0 + 2.1n = 12.7 + -15
2.1n = 12.7 + -15

Combine like terms: 12.7 + -15 = -2.3
2.1n = -2.3

Divide each side by '2.1'.
n = -1.095238095

Simplifying
n = -1.095238095

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