Solve for a p=a+b+c

$p = a + b + c$

Step 1

Rewrite the equation as $a + b + c = p$ .

$a + b + c = p$

Step 2

Move all terms not containing $a$ to the right side of the equation.

Subtract $b$ from both sides of the equation.

$a + c = p - b$

Subtract $c$ from both sides of the equation.

$a = p - b - c$