42=3[2-3h]

Solution for 42=3[2-3h] equation:

Simplifying
42 = 3[2 + -3h]
42 = [2 * 3 + -3h * 3]
42 = [6 + -9h]

Solving
42 = 6 + -9h

Solving for variable 'h'.

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

Add '9h' to each side of the equation.
42 + 9h = 6 + -9h + 9h

Combine like terms: -9h + 9h = 0
42 + 9h = 6 + 0
42 + 9h = 6

Add '-42' to each side of the equation.
42 + -42 + 9h = 6 + -42

Combine like terms: 42 + -42 = 0
0 + 9h = 6 + -42
9h = 6 + -42

Combine like terms: 6 + -42 = -36
9h = -36

Divide each side by '9'.
h = -4

Simplifying
h = -4