The equation provided is:

$d = b + c + a$

We need to solve for $a$ in terms of $b$, $c$, and $d$.

Steps:

1. Subtract $b + c$ from both sides of the equation to isolate $a$:

$a = d - (b + c)$

2. Simplify the equation:

$a = d - b - c$

Thus, the solution is:

$a = d - b - c$

Would you like further details or have any questions?

Here are 5 related questions to practice:

1. Solve for $b$ in terms of $a$, $c$, and $d$: $d = b + c + a$.
2. Solve for $d$ when $a = 5$, $b = 3$, and $c = 4$.
3. If $a + b + c = d$, how can you express $b$ in terms of the others?
4. Given the equation $d = 2b + a$, solve for $a$.
5. How would the solution change if $d = b + c - a$?

Tip:

When solving for a variable, try to isolate it on one side by using inverse operations (addition ↔ subtraction, multiplication ↔ division).