(4-n)2.1-3.4n=15

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Solution for (4-n)2.1-3.4n=15 equation: 


Simplifying
(4 + -1n) * 2.1 + -3.4n = 15

Reorder the terms for easier multiplication:
2.1(4 + -1n) + -3.4n = 15
(4 * 2.1 + -1n * 2.1) + -3.4n = 15
(8.4 + -2.1n) + -3.4n = 15

Combine like terms: -2.1n + -3.4n = -5.5n
8.4 + -5.5n = 15

Solving
8.4 + -5.5n = 15

Solving for variable 'n'.

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

Add '-8.4' to each side of the equation.
8.4 + -8.4 + -5.5n = 15 + -8.4

Combine like terms: 8.4 + -8.4 = 0.0
0.0 + -5.5n = 15 + -8.4
-5.5n = 15 + -8.4

Combine like terms: 15 + -8.4 = 6.6
-5.5n = 6.6

Divide each side by '-5.5'.
n = -1.2

Simplifying
n = -1.2

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