4.2=1.2n

Solution for 4.2=1.2n equation:

Simplifying
4.2 = 1.2n

Solving
4.2 = 1.2n

Solving for variable 'n'.

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

Add '-1.2n' to each side of the equation.
4.2 + -1.2n = 1.2n + -1.2n

Combine like terms: 1.2n + -1.2n = 0.0
4.2 + -1.2n = 0.0

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -1.2n = 0.0 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -1.2n = 0.0 + -4.2
-1.2n = 0.0 + -4.2

Combine like terms: 0.0 + -4.2 = -4.2
-1.2n = -4.2

Divide each side by '-1.2'.
n = 3.5

Simplifying
n = 3.5