Chapter 2 - Solving Equations - 2-4 Solving Equations with Variables on Both Sides - Practice and Problem-Solving Exercises - Page 106: 33

$d = \frac{2}{63}$

$3.2 - 4d = 2.3d + 3$ Subtract $2.3d$ from both sides of the equation. $3.2 - 4d - 2.3d = 2.3d + 3- 2.3d$ $3.2 - 6.3d = 3$ Subtract $3.2$ from both sides of the equation. $-6.3d = -0.2$ Multiply both sides by $10.$ $-63d = -2$ Divide both sides by $-63$ to isolate $d$. $d = \frac{2}{63}$