5+.1n+.2n-2+.4n=21

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Solution for 5+.1n+.2n-2+.4n=21 equation:


Simplifying
5 + 0.1n + 0.2n + -2 + 0.4n = 21

Reorder the terms:
5 + -2 + 0.1n + 0.2n + 0.4n = 21

Combine like terms: 5 + -2 = 3
3 + 0.1n + 0.2n + 0.4n = 21

Combine like terms: 0.1n + 0.2n = 0.3n
3 + 0.3n + 0.4n = 21

Combine like terms: 0.3n + 0.4n = 0.7n
3 + 0.7n = 21

Solving
3 + 0.7n = 21

Solving for variable 'n'.

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

Add '-3' to each side of the equation.
3 + -3 + 0.7n = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 0.7n = 21 + -3
0.7n = 21 + -3

Combine like terms: 21 + -3 = 18
0.7n = 18

Divide each side by '0.7'.
n = 25.71428571

Simplifying
n = 25.71428571

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