4.2=0.8l

Solution for 4.2=0.8l equation:

Simplifying
4.2 = 0.8l

Solving
4.2 = 0.8l

Solving for variable 'l'.

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

Add '-0.8l' to each side of the equation.
4.2 + -0.8l = 0.8l + -0.8l

Combine like terms: 0.8l + -0.8l = 0.0
4.2 + -0.8l = 0.0

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -0.8l = 0.0 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -0.8l = 0.0 + -4.2
-0.8l = 0.0 + -4.2

Combine like terms: 0.0 + -4.2 = -4.2
-0.8l = -4.2

Divide each side by '-0.8'.
l = 5.25

Simplifying
l = 5.25