Solve for a 2a+b=c

$2 a + b = c$

Subtract $b$ from both sides of the equation.

$2 a = c - b$

Divide each term in $2 a = c - b$ by $2$ and simplify.

Divide each term in $2 a = c - b$ by $2$ .

$\frac{2 a}{2} = \frac{c}{2} + \frac{- b}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 a}{2} = \frac{c}{2} + \frac{- b}{2}$

Divide $a$ by $1$ .

$a = \frac{c}{2} + \frac{- b}{2}$

Simplify the right side.

Move the negative in front of the fraction.

$a = \frac{c}{2} - \frac{b}{2}$