.2(2.1)=n

Solution for .2(2.1)=n equation:

Simplifying
0.2(2.1) = n

Multiply 0.2 * 2.1
0.42 = n

Solving
0.42 = n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
0.42 + -1n = n + -1n

Combine like terms: n + -1n = 0
0.42 + -1n = 0

Add '-0.42' to each side of the equation.
0.42 + -0.42 + -1n = 0 + -0.42

Combine like terms: 0.42 + -0.42 = 0.00
0.00 + -1n = 0 + -0.42
-1n = 0 + -0.42

Combine like terms: 0 + -0.42 = -0.42
-1n = -0.42

Divide each side by '-1'.
n = 0.42

Simplifying
n = 0.42