40=1.6(d-2)

Solution for 40=1.6(d-2) equation:

Simplifying
40 = 1.6(d + -2)

Reorder the terms:
40 = 1.6(-2 + d)
40 = (-2 * 1.6 + d * 1.6)
40 = (-3.2 + 1.6d)

Solving
40 = -3.2 + 1.6d

Solving for variable 'd'.

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

Add '-1.6d' to each side of the equation.
40 + -1.6d = -3.2 + 1.6d + -1.6d

Combine like terms: 1.6d + -1.6d = 0.0
40 + -1.6d = -3.2 + 0.0
40 + -1.6d = -3.2

Add '-40' to each side of the equation.
40 + -40 + -1.6d = -3.2 + -40

Combine like terms: 40 + -40 = 0
0 + -1.6d = -3.2 + -40
-1.6d = -3.2 + -40

Combine like terms: -3.2 + -40 = -43.2
-1.6d = -43.2

Divide each side by '-1.6'.
d = 27

Simplifying
d = 27