# How do you solve for a: in p=a+b+3c?

$a = p - b - 3 c$

#### Explanation:

We start from the given equation
$p = a + b + 3 c$

We are solving for $a$. This means at the end of the math process, we should have $a =$ to something.

$p = a + b + 3 c$
By subtraction property of equality, subtract $b$ and $3 c$ from both sides of the equation

$p - b - 3 c = a + b + 3 c - b - 3 c$

$p - b - 3 c = a$

and

$a = p - b - 3 c$

God bless....I hope the explanation is useful.