Solve for s y=(r+s+t)/3

$y = \frac{r + s + t}{3}$

Rewrite the equation as $\frac{r + s + t}{3} = y$ .

$\frac{r + s + t}{3} = y$

Multiply both sides of the equation by $3$ .

$3 \cdot \frac{r + s + t}{3} = 3 \cdot y$

Cancel the common factor of $3$ .

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Cancel the common factor.

$3 \cdot \frac{r + s + t}{3} = 3 \cdot y$

Rewrite the expression.

$r + s + t = 3 \cdot y$

$r + s + t = 3 y$

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

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Subtract $r$ from both sides of the equation.

$s + t = 3 y - r$

Subtract $t$ from both sides of the equation.

$s = 3 y - r - t$

Solve for s y=(r+s+t)/3

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