0.7*(6-0.3n)=-2.1

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Solution for 0.7*(6-0.3n)=-2.1 equation: 


Simplifying
0.7(6 + -0.3n) = -2.1
(6 * 0.7 + -0.3n * 0.7) = -2.1
(4.2 + -0.21n) = -2.1

Solving
4.2 + -0.21n = -2.1

Solving for variable 'n'.

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

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -0.21n = -2.1 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -0.21n = -2.1 + -4.2
-0.21n = -2.1 + -4.2

Combine like terms: -2.1 + -4.2 = -6.3
-0.21n = -6.3

Divide each side by '-0.21'.
n = 30

Simplifying
n = 30

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