[2a+1.6]=4.2

Solution for [2a+1.6]=4.2 equation:

Simplifying
[2a + 1.6] = 4.2

Reorder the terms:
[1.6 + 2a] = 4.2

Remove brackets around [1.6 + 2a]
1.6 + 2a = 4.2

Solving
1.6 + 2a = 4.2

Solving for variable 'a'.

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

Add '-1.6' to each side of the equation.
1.6 + -1.6 + 2a = 4.2 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 2a = 4.2 + -1.6
2a = 4.2 + -1.6

Combine like terms: 4.2 + -1.6 = 2.6
2a = 2.6

Divide each side by '2'.
a = 1.3

Simplifying
a = 1.3