Solve. Check your solution. \[ \begin{array}{l}d-2.1=-18.7 \\ d=\square \text { (Type an integer or a decimal.) }\end{array} \]

To solve the equation \( d - 2.1 = -18.7 \), you need to isolate \( d \) by adding 2.1 to both sides: \[ d = -18.7 + 2.1 \] Now, calculate the right-hand side: \(-18.7 + 2.1 = -16.6\) So, the solution is: \[ d = -16.6 \] To check the solution, substitute \( d \) back into the original equation: \[ -16.6 - 2.1 = -18.7 \] Calculating the left side gives: \(-16.6 - 2.1 = -18.7\) Since both sides match, the solution \( d = -16.6 \) is confirmed.