54.15=15.75+3.2d

Solution for 54.15=15.75+3.2d equation:

Simplifying
54.15 = 15.75 + 3.2d

Solving
54.15 = 15.75 + 3.2d

Solving for variable 'd'.

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

Add '-3.2d' to each side of the equation.
54.15 + -3.2d = 15.75 + 3.2d + -3.2d

Combine like terms: 3.2d + -3.2d = 0.0
54.15 + -3.2d = 15.75 + 0.0
54.15 + -3.2d = 15.75

Add '-54.15' to each side of the equation.
54.15 + -54.15 + -3.2d = 15.75 + -54.15

Combine like terms: 54.15 + -54.15 = 0.00
0.00 + -3.2d = 15.75 + -54.15
-3.2d = 15.75 + -54.15

Combine like terms: 15.75 + -54.15 = -38.4
-3.2d = -38.4

Divide each side by '-3.2'.
d = 12

Simplifying
d = 12